diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 32642d01f..c611b6e6a 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1059,7 +1059,7 @@ Drupal 4.5.0, 2004-10-18
 - Filter system:
     * Added support for using multiple input formats on the site
     * Expanded the embedded PHP-code feature so it can be used everywhere
-    * Added support for role-dependant filtering, through input formats
+    * Added support for role-dependent filtering, through input formats
 - UI translation:
     * Managing translations is now completely done through the administration interface
     * Added support for importing/exporting gettext .po files
diff --git a/authorize.php b/authorize.php
index 9961b54b9..3c0bd7b36 100644
--- a/authorize.php
+++ b/authorize.php
@@ -74,7 +74,7 @@ function authorize_access_allowed() {
 global $conf;
 
 // We have to enable the user and system modules, even to check access and
-// display errors via the maintainence theme.
+// display errors via the maintenance theme.
 $module_list['system']['filename'] = 'modules/system/system.module';
 $module_list['user']['filename'] = 'modules/user/user.module';
 module_list(TRUE, FALSE, FALSE, $module_list);
diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index 545beba21..e76d52699 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -2449,7 +2449,7 @@ function drupal_installation_attempted() {
  * non-installation time, such as while installing the module from the the
  * module administration page.
  *
- * Example useage:
+ * Example usage:
  * @code
  *   $t = get_t();
  *   $translated = $t('translate this');
diff --git a/includes/common.inc b/includes/common.inc
index 355ef379b..a94b011f1 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -3019,7 +3019,7 @@ function drupal_sort_css_js($a, $b) {
  * are always groupable, and items of the 'external' type are never groupable.
  * This function also ensures that the process of grouping items does not change
  * their relative order. This requirement may result in multiple groups for the
- * same type, media, and browsers, if needed to accomodate other items in
+ * same type, media, and browsers, if needed to accommodate other items in
  * between.
  *
  * @param $css
diff --git a/includes/database/database.inc b/includes/database/database.inc
index 610861429..c77bcffbf 100644
--- a/includes/database/database.inc
+++ b/includes/database/database.inc
@@ -152,7 +152,7 @@
  *   }
  *
  *   // $txn goes out of scope here.  Unless the transaction was rolled back, it
- *   // gets automatically commited here.
+ *   // gets automatically committed here.
  * }
  *
  * function my_other_function($id) {
diff --git a/includes/database/query.inc b/includes/database/query.inc
index c7363f238..c77968767 100644
--- a/includes/database/query.inc
+++ b/includes/database/query.inc
@@ -839,7 +839,7 @@ class DeleteQuery extends Query implements QueryConditionInterface {
    * Executes the DELETE query.
    *
    * @return
-   *   The return value is dependant on the database connection.
+   *   The return value is dependent on the database connection.
    */
   public function execute() {
     $values = array();
diff --git a/includes/database/sqlite/database.inc b/includes/database/sqlite/database.inc
index 0fc0b5528..3e2490b00 100644
--- a/includes/database/sqlite/database.inc
+++ b/includes/database/sqlite/database.inc
@@ -119,7 +119,7 @@ class DatabaseConnection_sqlite extends DatabaseConnection {
         try {
           $count = $this->query('SELECT COUNT(*) FROM ' . $prefix . '.sqlite_master WHERE type = :type AND name NOT LIKE :pattern', array(':type' => 'table', ':pattern' => 'sqlite_%'))->fetchField();
 
-          // We can prune the database file if it doens't have any tables.
+          // We can prune the database file if it doesn't have any tables.
           if ($count == 0) {
             // Detach the database.
             $this->query('DETACH DATABASE :schema', array(':schema' => $prefix));
diff --git a/includes/entity.inc b/includes/entity.inc
index 45d697c80..07ee06162 100644
--- a/includes/entity.inc
+++ b/includes/entity.inc
@@ -307,7 +307,7 @@ class DrupalDefaultEntityController implements DrupalEntityControllerInterface {
    * @param $queried_entities
    *   Associative array of query results, keyed on the entity ID.
    * @param $revision_id
-   *   ID of the revision that was loaded, or FALSE if teh most current revision
+   *   ID of the revision that was loaded, or FALSE if the most current revision
    *   was loaded.
    */
   protected function attachLoad(&$queried_entities, $revision_id = FALSE) {
diff --git a/includes/errors.inc b/includes/errors.inc
index bd31bebed..cb708d860 100644
--- a/includes/errors.inc
+++ b/includes/errors.inc
@@ -136,7 +136,7 @@ function _drupal_decode_exception($exception) {
 }
 
 /**
- * Render an error message for an exception without any possibility of a further exception occuring.
+ * Render an error message for an exception without any possibility of a further exception occurring.
  *
  * @param $exception
  *   The exception object that was thrown.
diff --git a/includes/form.inc b/includes/form.inc
index dc2a5a01d..42c108b8e 100644
--- a/includes/form.inc
+++ b/includes/form.inc
@@ -919,7 +919,7 @@ function drupal_process_form($form_id, &$form, &$form_state) {
   // have set $form_state['cache'] to indicate that the form and form state
   // shall be cached. But the form may only be cached if the 'no_cache' property
   // is not set to TRUE. Only cache $form as it was prior to form_builder(),
-  // because form_builder() must run for each request to accomodate new user
+  // because form_builder() must run for each request to accommodate new user
   // input. Rebuilt forms are not cached here, because drupal_rebuild_form()
   // already takes care of that.
   if (!$form_state['rebuild'] && $form_state['cache'] && empty($form_state['no_cache'])) {
@@ -1941,7 +1941,7 @@ function _form_builder_handle_input_element($form_id, &$element, &$form_state) {
   // drupal_form_submit() must not be able to get around this. Forms that set
   // #access=FALSE on an element usually allow access for some users, so forms
   // submitted with drupal_form_submit() may bypass access restriction and be
-  // treated as high-privelege users instead.
+  // treated as high-privilege users instead.
   $process_input = empty($element['#disabled']) && ($form_state['programmed'] || ($form_state['process_input'] && (!isset($element['#access']) || $element['#access'])));
 
   // Set the element's #value property.
diff --git a/includes/pager.inc b/includes/pager.inc
index 7a3a7be30..a5d3e6be0 100644
--- a/includes/pager.inc
+++ b/includes/pager.inc
@@ -200,7 +200,7 @@ function pager_find_page($element = 0) {
  * to theme('pager') will render a pager that correctly corresponds to the
  * items being displayed.
  *
- * If the items being displayed result from a database query peformed using
+ * If the items being displayed result from a database query performed using
  * Drupal's database API, and if you have control over the construction of the
  * database query, you do not need to call this function directly; instead, you
  * can simply extend the query object with the 'PagerDefault' extender before
diff --git a/includes/theme.inc b/includes/theme.inc
index c4ce2a735..17c49f1c4 100644
--- a/includes/theme.inc
+++ b/includes/theme.inc
@@ -2097,7 +2097,7 @@ function template_preprocess(&$variables, $hook) {
 }
 
 /**
- * Returns hook-independant variables to template_preprocess().
+ * Returns hook-independent variables to template_preprocess().
  */
 function _template_preprocess_default_variables() {
   global $user;
diff --git a/includes/utility.inc b/includes/utility.inc
index 254313f73..df6c48fb9 100644
--- a/includes/utility.inc
+++ b/includes/utility.inc
@@ -11,7 +11,7 @@
  * @param $var
  *   The variable to export.
  * @param $prefix
- *   A prefix that will be added at the begining of every lines of the output.
+ *   A prefix that will be added at the beginning of every lines of the output.
  * @return
  *   The variable exported in a way compatible to Drupal's coding standards.
  */
diff --git a/modules/contact/contact.test b/modules/contact/contact.test
index bc44f5a04..129eb30ce 100644
--- a/modules/contact/contact.test
+++ b/modules/contact/contact.test
@@ -262,7 +262,7 @@ class ContactSitewideTestCase extends DrupalWebTestCase {
     foreach ($categories as $category) {
       $category_name = db_query("SELECT category FROM {contact} WHERE cid = :cid", array(':cid' => $category))->fetchField();
       $this->drupalPost('admin/structure/contact/delete/' . $category, array(), t('Delete'));
-      $this->assertRaw(t('Category %category has been deleted.', array('%category' => $category_name)), t('Category deleted sucessfully.'));
+      $this->assertRaw(t('Category %category has been deleted.', array('%category' => $category_name)), t('Category deleted successfully.'));
     }
   }
 
diff --git a/modules/field/field.crud.inc b/modules/field/field.crud.inc
index a6aaab126..e34c0c528 100644
--- a/modules/field/field.crud.inc
+++ b/modules/field/field.crud.inc
@@ -727,7 +727,7 @@ function field_read_instances($params = array(), $include_additional = array())
  *   An instance structure.
  * @param $field_cleanup
  *   If TRUE, the field will be deleted as well if its last instance is being
- *   deleted. If FALSE, it is the caller's responsability to handle the case of
+ *   deleted. If FALSE, it is the caller's responsibility to handle the case of
  *   fields left without instances. Defaults to TRUE.
  */
 function field_delete_instance($instance, $field_cleanup = TRUE) {
diff --git a/modules/field/modules/list/list.module b/modules/field/modules/list/list.module
index 2518ebcfc..1d72be44a 100644
--- a/modules/field/modules/list/list.module
+++ b/modules/field/modules/list/list.module
@@ -248,7 +248,7 @@ function list_allowed_values($field) {
  * Parses a string of 'allowed values' into an array.
  *
  * @param $string
- *   The list of allowed values in string format descibed in
+ *   The list of allowed values in string format described in
  *   list_allowed_values_string().
  * @param $field_type
  *   The field type. Either 'list_number' or 'list_text'.
diff --git a/modules/field/modules/list/tests/list.test b/modules/field/modules/list/tests/list.test
index dec09560f..765901a84 100644
--- a/modules/field/modules/list/tests/list.test
+++ b/modules/field/modules/list/tests/list.test
@@ -303,7 +303,7 @@ class ListFieldUITestCase extends FieldTestCase {
     $this->field_name = 'field_list_boolean';
     $this->createListField('list_boolean');
 
-    // Check that the seperate 'On' and 'Off' form fields work.
+    // Check that the separate 'On' and 'Off' form fields work.
     $on = $this->randomName();
     $off = $this->randomName();
     $allowed_values = array(1 => $on, 0 => $off);
diff --git a/modules/field_ui/field_ui.module b/modules/field_ui/field_ui.module
index 27ef3c2d7..17b4aea60 100644
--- a/modules/field_ui/field_ui.module
+++ b/modules/field_ui/field_ui.module
@@ -17,7 +17,7 @@ function field_ui_help($path, $arg) {
       $output .= '<h3>' . t('Uses') . '</h3>';
       $output .= '<dl>';
       $output .= '<dt>' . t('Planning fields') . '</dt>';
-      $output .= '<dd>' . t('There are several decisions you will need to make before definining a field for content, comments, etc.:') . '<dl>';
+      $output .= '<dd>' . t('There are several decisions you will need to make before defining a field for content, comments, etc.:') . '<dl>';
       $output .= '<dt>' . t('What the field will be called') . '</dt>';
       $output .= '<dd>' . t('A field has a <em>label</em> (the name displayed in the user interface) and a <em>machine name</em> (the name used internally). The label can be changed after you create the field, if needed, but the machine name cannot be changed after you have created the field.') . '</li>';
       $output .= '<dt>' . t('What type of data the field will store') . '</dt>';
diff --git a/modules/filter/filter.module b/modules/filter/filter.module
index 9e1481207..71dc21ac5 100644
--- a/modules/filter/filter.module
+++ b/modules/filter/filter.module
@@ -1090,7 +1090,7 @@ function filter_dom_serialize($dom_document) {
  * throw exceptions.
  *
  * This function attempts to solve the problem by creating a DocumentFragment
- * and immitating the behavior in drupal_get_js(), commenting the CDATA tag.
+ * and imitating the behavior in drupal_get_js(), commenting the CDATA tag.
  *
  * @param $dom_document
  *   The DOMDocument containing the $dom_element.
diff --git a/modules/forum/forum.module b/modules/forum/forum.module
index 6e9561346..65c548941 100644
--- a/modules/forum/forum.module
+++ b/modules/forum/forum.module
@@ -215,7 +215,7 @@ function forum_menu_local_tasks_alter(&$data, $router_item, $root_path) {
  * Implements hook_entity_info_alter().
  */
 function forum_entity_info_alter(&$info) {
-  // Take over URI constuction for taxonomy terms that are forums.
+  // Take over URI construction for taxonomy terms that are forums.
   if ($vid = variable_get('forum_nav_vocabulary', 0)) {
     // Within hook_entity_info(), we can't invoke entity_load() as that would
     // cause infinite recursion, so we call taxonomy_vocabulary_get_names()
diff --git a/modules/node/node.test b/modules/node/node.test
index 8a1899eb3..6c3a678d5 100644
--- a/modules/node/node.test
+++ b/modules/node/node.test
@@ -1957,7 +1957,7 @@ class NodeBuildContent extends DrupalWebTestCase {
   function testNodeRebuildContent() {
     $node = $this->drupalCreateNode();
 
-    // Set a property in the content array so we can test for its existance later on.
+    // Set a property in the content array so we can test for its existence later on.
     $node->content['test_content_property'] = array('#value' => $this->randomString());
     $content = node_build_content($node);
 
diff --git a/modules/openid/openid.test b/modules/openid/openid.test
index 442a358ee..afb9068c6 100644
--- a/modules/openid/openid.test
+++ b/modules/openid/openid.test
@@ -324,7 +324,7 @@ class OpenIDFunctionalTestCase extends OpenIDWebTestCase {
   function addRedirectedIdentity($identity, $version = 2, $local_id = 'http://example.com/xrds', $claimed_id = NULL, $redirects = 0) {
     // Set the final destination URL which is the same as the Claimed
     // Identifier, we insert the same identifier also to the provider response,
-    // but provider could futher change the Claimed ID actually (e.g. it could
+    // but provider could further change the Claimed ID actually (e.g. it could
     // add unique fragment).
     variable_set('openid_test_redirect_url', $identity);
     variable_set('openid_test_response', array('openid.claimed_id' => $identity));
diff --git a/modules/overlay/overlay.api.php b/modules/overlay/overlay.api.php
index c763d1f5b..bc23546df 100644
--- a/modules/overlay/overlay.api.php
+++ b/modules/overlay/overlay.api.php
@@ -15,7 +15,7 @@
  *
  * The parent window is initialized when a page is displayed in which the
  * overlay might be required to be displayed, so modules can act here if they
- * need to take action to accomodate the possibility of the overlay appearing
+ * need to take action to accommodate the possibility of the overlay appearing
  * within a Drupal page.
  */
 function hook_overlay_parent_initialize() {
diff --git a/modules/profile/profile.test b/modules/profile/profile.test
index 83bed25a5..09123d8c5 100644
--- a/modules/profile/profile.test
+++ b/modules/profile/profile.test
@@ -399,7 +399,7 @@ class ProfileBlockTestCase extends ProfileTestCase {
   }
 
   function testAuthorInformationBlock() {
-    // Set the block to a region to confirm the block is availble.
+    // Set the block to a region to confirm the block is available.
     $edit = array();
     $edit['blocks[profile_author-information][region]'] = 'footer';
     $this->drupalPost('admin/structure/block', $edit, t('Save blocks'));
diff --git a/modules/search/search.test b/modules/search/search.test
index 488a45e80..a6ed0dfee 100644
--- a/modules/search/search.test
+++ b/modules/search/search.test
@@ -332,7 +332,7 @@ class SearchAdvancedSearchForm extends DrupalWebTestCase {
 
     // Assert that the dummy title doesn't equal the real title.
     $dummy_title = 'Lorem ipsum';
-    $this->assertNotEqual($dummy_title, $this->node->title, t("Dummy title doens't equal node title"));
+    $this->assertNotEqual($dummy_title, $this->node->title, t("Dummy title doesn't equal node title"));
 
     // Search for the dummy title with a GET query.
     $this->drupalGet('search/node/' . $dummy_title);
@@ -584,11 +584,11 @@ class SearchBlockTestCase extends DrupalWebTestCase {
   }
 
   function testSearchFormBlock() {
-    // Set block title to confirm that the interface is availble.
+    // Set block title to confirm that the interface is available.
     $this->drupalPost('admin/structure/block/manage/search/form/configure', array('title' => $this->randomName(8)), t('Save block'));
     $this->assertText(t('The block configuration has been saved.'), t('Block configuration set.'));
 
-    // Set the block to a region to confirm block is availble.
+    // Set the block to a region to confirm block is available.
     $edit = array();
     $edit['blocks[search_form][region]'] = 'footer';
     $this->drupalPost('admin/structure/block', $edit, t('Save blocks'));
diff --git a/modules/simpletest/drupal_web_test_case.php b/modules/simpletest/drupal_web_test_case.php
index eb1907cb5..2b23a3bb4 100644
--- a/modules/simpletest/drupal_web_test_case.php
+++ b/modules/simpletest/drupal_web_test_case.php
@@ -1446,7 +1446,7 @@ protected function refreshVariables() {
   protected function tearDown() {
     global $user, $language;
 
-    // In case a fatal error occured that was not in the test process read the
+    // In case a fatal error occurred that was not in the test process read the
     // log to pick up any fatal errors.
     simpletest_log_read($this->testId, $this->databasePrefix, get_class($this), TRUE);
 
diff --git a/modules/simpletest/files/css_test_files/comment_hacks.css.unoptimized.css b/modules/simpletest/files/css_test_files/comment_hacks.css.unoptimized.css
index ff50eaeaf..c47e8429a 100644
--- a/modules/simpletest/files/css_test_files/comment_hacks.css.unoptimized.css
+++ b/modules/simpletest/files/css_test_files/comment_hacks.css.unoptimized.css
@@ -4,7 +4,7 @@
 *
 */
 /*
-A large comment block to test for segfaults and speed. This is 60K a's. Extreme but usefull to demonstrate flaws in comment striping regexp. aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa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/
+A large comment block to test for segfaults and speed. This is 60K a's. Extreme but useful to demonstrate flaws in comment striping regexp. 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/
 .test1 { display:block;}
 
 /* A multiline IE-mac hack (v.2) taken fron Zen theme*/
diff --git a/modules/simpletest/simpletest.module b/modules/simpletest/simpletest.module
index 586b23ae7..b820f5307 100644
--- a/modules/simpletest/simpletest.module
+++ b/modules/simpletest/simpletest.module
@@ -272,7 +272,7 @@ function simpletest_log_read($test_id, $prefix, $test_class, $during_test = FALS
         DrupalTestCase::insertAssert($test_id, $test_class, FALSE, $match[2], $match[1], $caller);
       }
       else {
-        // Unkown format, place the entire message in the log.
+        // Unknown format, place the entire message in the log.
         DrupalTestCase::insertAssert($test_id, $test_class, FALSE, $line, 'Fatal error');
       }
       $found = TRUE;
@@ -398,7 +398,7 @@ function simpletest_generate_file($filename, $width, $lines, $type = 'binary-tex
         break;
     }
   }
-  $text = wordwrap($text, $width - 1, "\n", TRUE) . "\n"; // Add \n for symetrical file.
+  $text = wordwrap($text, $width - 1, "\n", TRUE) . "\n"; // Add \n for symmetrical file.
 
   // Create filename.
   file_put_contents('public://' . $filename . '.txt', $text);
diff --git a/modules/simpletest/simpletest.pages.inc b/modules/simpletest/simpletest.pages.inc
index d2d4a91bc..696d14718 100644
--- a/modules/simpletest/simpletest.pages.inc
+++ b/modules/simpletest/simpletest.pages.inc
@@ -305,7 +305,7 @@ function simpletest_result_form($form, &$form_state, $test_id) {
   );
   $form['action']['filter']['#default_value'] = ($filter['fail'] ? 'fail' : 'all');
 
-  // Catagorized test classes for to be used with selected filter value.
+  // Categorized test classes for to be used with selected filter value.
   $form['action']['filter_pass'] = array(
     '#type' => 'hidden',
     '#default_value' => implode(',', $filter['pass']),
diff --git a/modules/simpletest/tests/bootstrap.test b/modules/simpletest/tests/bootstrap.test
index 14c16a95b..cb4fe8e2a 100644
--- a/modules/simpletest/tests/bootstrap.test
+++ b/modules/simpletest/tests/bootstrap.test
@@ -308,15 +308,15 @@ class HookBootExitTestCase extends DrupalWebTestCase {
     variable_set('page_cache_invoke_hooks', FALSE);
     $this->assertTrue(cache_get(url('', array('absolute' => TRUE)), 'cache_page'), t('Page has been cached.'));
     $this->drupalGet('');
-    $this->assertEqual(db_query('SELECT COUNT(*) FROM {watchdog} WHERE type = :type AND message = :message', array(':type' => 'system_test', ':message' => 'hook_boot'))->fetchField(), $calls, t('hook_boot not called with agressive cache and a cached page.'));
-    $this->assertEqual(db_query('SELECT COUNT(*) FROM {watchdog} WHERE type = :type AND message = :message', array(':type' => 'system_test', ':message' => 'hook_exit'))->fetchField(), $calls, t('hook_exit not called with agressive cache and a cached page.'));
+    $this->assertEqual(db_query('SELECT COUNT(*) FROM {watchdog} WHERE type = :type AND message = :message', array(':type' => 'system_test', ':message' => 'hook_boot'))->fetchField(), $calls, t('hook_boot not called with aggressive cache and a cached page.'));
+    $this->assertEqual(db_query('SELECT COUNT(*) FROM {watchdog} WHERE type = :type AND message = :message', array(':type' => 'system_test', ':message' => 'hook_exit'))->fetchField(), $calls, t('hook_exit not called with aggressive cache and a cached page.'));
 
     // Test with page cache cleared, boot and exit should be called.
     $this->assertTrue(db_delete('cache_page')->execute(), t('Page cache cleared.'));
     $this->drupalGet('');
     $calls++;
-    $this->assertEqual(db_query('SELECT COUNT(*) FROM {watchdog} WHERE type = :type AND message = :message', array(':type' => 'system_test', ':message' => 'hook_boot'))->fetchField(), $calls, t('hook_boot called with agressive cache and no cached page.'));
-    $this->assertEqual(db_query('SELECT COUNT(*) FROM {watchdog} WHERE type = :type AND message = :message', array(':type' => 'system_test', ':message' => 'hook_exit'))->fetchField(), $calls, t('hook_exit called with agressive cache and no cached page.'));
+    $this->assertEqual(db_query('SELECT COUNT(*) FROM {watchdog} WHERE type = :type AND message = :message', array(':type' => 'system_test', ':message' => 'hook_boot'))->fetchField(), $calls, t('hook_boot called with aggressive cache and no cached page.'));
+    $this->assertEqual(db_query('SELECT COUNT(*) FROM {watchdog} WHERE type = :type AND message = :message', array(':type' => 'system_test', ':message' => 'hook_exit'))->fetchField(), $calls, t('hook_exit called with aggressive cache and no cached page.'));
   }
 }
 
diff --git a/modules/simpletest/tests/database_test.test b/modules/simpletest/tests/database_test.test
index 2a3d4c416..87d386aa7 100644
--- a/modules/simpletest/tests/database_test.test
+++ b/modules/simpletest/tests/database_test.test
@@ -2096,7 +2096,7 @@ class DatabaseSelectComplexTestCase extends DatabaseTestCase {
    */
   function testCountQueryFieldRemovals() {
     // countQuery should remove all fields and expressions, so this can be
-    // tested by adding a non-existant field and expression: if it ends
+    // tested by adding a non-existent field and expression: if it ends
     // up in the query, an error will be thrown. If not, it will return the
     // number of records, which in this case happens to be 4 (there are four
     // records in the {test} table).
diff --git a/modules/simpletest/tests/file.test b/modules/simpletest/tests/file.test
index 3633bae11..0e8c639e7 100644
--- a/modules/simpletest/tests/file.test
+++ b/modules/simpletest/tests/file.test
@@ -1606,7 +1606,7 @@ class FileMoveTest extends FileHookTestCase {
     $result = file_move(clone $source, $desired_filepath, FILE_EXISTS_ERROR);
 
     // Check the return status and that the contents changed.
-    $this->assertTrue($result, t('File moved sucessfully.'));
+    $this->assertTrue($result, t('File moved successfully.'));
     $this->assertFalse(file_exists($source->uri));
     $this->assertEqual($contents, file_get_contents($result->uri), t('Contents of file correctly written.'));
 
@@ -1638,7 +1638,7 @@ class FileMoveTest extends FileHookTestCase {
     $result = file_move(clone $source, $target->uri, FILE_EXISTS_RENAME);
 
     // Check the return status and that the contents changed.
-    $this->assertTrue($result, t('File moved sucessfully.'));
+    $this->assertTrue($result, t('File moved successfully.'));
     $this->assertFalse(file_exists($source->uri));
     $this->assertEqual($contents, file_get_contents($result->uri), t('Contents of file correctly written.'));
 
@@ -1675,7 +1675,7 @@ class FileMoveTest extends FileHookTestCase {
     // Look at the results.
     $this->assertEqual($contents, file_get_contents($result->uri), t('Contents of file were overwritten.'));
     $this->assertFalse(file_exists($source->uri));
-    $this->assertTrue($result, t('File moved sucessfully.'));
+    $this->assertTrue($result, t('File moved successfully.'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(array('move', 'update', 'delete', 'load'));
@@ -1767,7 +1767,7 @@ class FileCopyTest extends FileHookTestCase {
     $result = file_copy(clone $source, $desired_uri, FILE_EXISTS_ERROR);
 
     // Check the return status and that the contents changed.
-    $this->assertTrue($result, t('File copied sucessfully.'));
+    $this->assertTrue($result, t('File copied successfully.'));
     $this->assertEqual($contents, file_get_contents($result->uri), t('Contents of file were copied correctly.'));
 
     // Check that the correct hooks were called.
@@ -1798,7 +1798,7 @@ class FileCopyTest extends FileHookTestCase {
     $result = file_copy(clone $source, $target->uri, FILE_EXISTS_RENAME);
 
     // Check the return status and that the contents changed.
-    $this->assertTrue($result, t('File copied sucessfully.'));
+    $this->assertTrue($result, t('File copied successfully.'));
     $this->assertEqual($contents, file_get_contents($result->uri), t('Contents of file were copied correctly.'));
     $this->assertNotEqual($result->uri, $source->uri, t('Returned file path has changed from the original.'));
 
@@ -1838,7 +1838,7 @@ class FileCopyTest extends FileHookTestCase {
     $result = file_copy(clone $source, $target->uri, FILE_EXISTS_REPLACE);
 
     // Check the return status and that the contents changed.
-    $this->assertTrue($result, t('File copied sucessfully.'));
+    $this->assertTrue($result, t('File copied successfully.'));
     $this->assertEqual($contents, file_get_contents($result->uri), t('Contents of file were overwritten.'));
     $this->assertDifferentFile($source, $result);
 
@@ -2160,7 +2160,7 @@ class FileValidateTest extends FileHookTestCase {
     $file = $this->createFile();
 
     // Empty validators.
-    $this->assertEqual(file_validate($file, array()), array(), t('Validating an empty array works succesfully.'));
+    $this->assertEqual(file_validate($file, array()), array(), t('Validating an empty array works successfully.'));
     $this->assertFileHooksCalled(array('validate'));
 
     // Use the file_test.module's test validator to ensure that passing tests
@@ -2245,7 +2245,7 @@ class FileSaveDataTest extends FileHookTestCase {
     $contents = $this->randomName(8);
 
     $result = file_save_data($contents, $existing->uri, FILE_EXISTS_RENAME);
-    $this->assertTrue($result, t("File saved sucessfully."));
+    $this->assertTrue($result, t("File saved successfully."));
 
     $this->assertEqual('public', file_uri_scheme($result->uri), t("File was placed in Drupal's files directory."));
     $this->assertEqual($result->filename, $existing->filename, t("Filename was set to the basename of the source, rather than that of the renamed file."));
@@ -2273,7 +2273,7 @@ class FileSaveDataTest extends FileHookTestCase {
     $contents = $this->randomName(8);
 
     $result = file_save_data($contents, $existing->uri, FILE_EXISTS_REPLACE);
-    $this->assertTrue($result, t('File saved sucessfully.'));
+    $this->assertTrue($result, t('File saved successfully.'));
 
     $this->assertEqual('public', file_uri_scheme($result->uri), t("File was placed in Drupal's files directory."));
     $this->assertEqual($result->filename, $existing->filename, t('Filename was set to the basename of the existing file, rather than preserving the original name.'));
diff --git a/modules/simpletest/tests/form.test b/modules/simpletest/tests/form.test
index e7ae9de3f..fe2c1bbfb 100644
--- a/modules/simpletest/tests/form.test
+++ b/modules/simpletest/tests/form.test
@@ -599,13 +599,13 @@ class FormsElementsLabelsTestCase extends DrupalWebTestCase {
     // Exercise various defaults for textboxes and modifications to ensure
     // appropriate override and correct behaviour.
     $elements = $this->xpath('//label[@for="edit-form-textfield-test-title-and-required"]/child::span[@class="form-required"]/parent::*/following-sibling::input[@id="edit-form-textfield-test-title-and-required"]');
-    $this->assertTrue(isset($elements[0]), t("Label preceeds textfield, with required marker inside label."));
+    $this->assertTrue(isset($elements[0]), t("Label precedes textfield, with required marker inside label."));
 
     $elements = $this->xpath('//input[@id="edit-form-textfield-test-no-title-required"]/preceding-sibling::label[@for="edit-form-textfield-test-no-title-required"]/span[@class="form-required"]');
-    $this->assertTrue(isset($elements[0]), t("Label tag with required marker preceeds required textfield with no title."));
+    $this->assertTrue(isset($elements[0]), t("Label tag with required marker precedes required textfield with no title."));
 
     $elements = $this->xpath('//input[@id="edit-form-textfield-test-title-invisible"]/preceding-sibling::label[@for="edit-form-textfield-test-title-invisible" and @class="element-invisible"]');
-    $this->assertTrue(isset($elements[0]), t("Label preceeding field and label class is element-invisible."));
+    $this->assertTrue(isset($elements[0]), t("Label preceding field and label class is element-invisible."));
 
     $elements = $this->xpath('//input[@id="edit-form-textfield-test-title"]/preceding-sibling::span[@class="form-required"]');
     $this->assertFalse(isset($elements[0]), t("No required marker on non-required field."));
diff --git a/modules/simpletest/tests/form_test.module b/modules/simpletest/tests/form_test.module
index 00be7d2e6..23aca244b 100644
--- a/modules/simpletest/tests/form_test.module
+++ b/modules/simpletest/tests/form_test.module
@@ -713,7 +713,7 @@ function form_label_test_form() {
   );
   $form['form_textfield_test_no_title_required'] = array(
     '#type' => 'textfield',
-    // We use an empty title, since not setting #title supresses the label
+    // We use an empty title, since not setting #title suppresses the label
     // and required marker.
     '#title' => '',
     '#required' => TRUE,
diff --git a/modules/simpletest/tests/menu.test b/modules/simpletest/tests/menu.test
index 0ec61dccf..5b4847f75 100644
--- a/modules/simpletest/tests/menu.test
+++ b/modules/simpletest/tests/menu.test
@@ -536,7 +536,7 @@ class MenuRouterTestCase extends DrupalWebTestCase {
   }
 
   /**
-   * Test menu maintainance hooks.
+   * Test menu maintenance hooks.
    */
   function testMenuItemHooks() {
     // Create an item.
diff --git a/modules/simpletest/tests/path.test b/modules/simpletest/tests/path.test
index 0c8ecdac4..4998ffa38 100644
--- a/modules/simpletest/tests/path.test
+++ b/modules/simpletest/tests/path.test
@@ -171,7 +171,7 @@ class UrlAlterFunctionalTest extends DrupalWebTestCase {
     $this->assertUrlInboundAlter('alias/test2', "user/$uid/edit");
     $this->assertUrlOutboundAlter("user/$uid/edit", 'alias/test2');
 
-    // Test a non-existant user is not altered.
+    // Test a non-existent user is not altered.
     $uid++;
     $this->assertUrlInboundAlter("user/$uid", "user/$uid");
     $this->assertUrlOutboundAlter("user/$uid", "user/$uid");
diff --git a/modules/simpletest/tests/upgrade/upgrade.test b/modules/simpletest/tests/upgrade/upgrade.test
index 6aadee379..7f934fe7b 100644
--- a/modules/simpletest/tests/upgrade/upgrade.test
+++ b/modules/simpletest/tests/upgrade/upgrade.test
@@ -137,7 +137,7 @@ abstract class UpgradePathTestCase extends DrupalWebTestCase {
   protected function tearDown() {
     global $user, $language;
 
-    // In case a fatal error occured that was not in the test process read the
+    // In case a fatal error occurred that was not in the test process read the
     // log to pick up any fatal errors.
     simpletest_log_read($this->testId, $this->databasePrefix, get_class($this), TRUE);
 
diff --git a/modules/system/system.api.php b/modules/system/system.api.php
index 1e0ff0fc2..cff51c4ff 100644
--- a/modules/system/system.api.php
+++ b/modules/system/system.api.php
@@ -4429,7 +4429,7 @@ function hook_menu_site_status_alter(&$menu_site_status, $path) {
 /**
  * Register information about FileTransfer classes provided by a module.
  *
- * The FileTransfer class allows transfering files over a specific type of
+ * The FileTransfer class allows transferring files over a specific type of
  * connection. Core provides classes for FTP and SSH. Contributed modules are
  * free to extend the FileTransfer base class to add other connection types,
  * and if these classes are registered via hook_filetransfer_info(), those
diff --git a/modules/system/system.tar.inc b/modules/system/system.tar.inc
index fd1d3c825..32bf7f066 100644
--- a/modules/system/system.tar.inc
+++ b/modules/system/system.tar.inc
@@ -169,7 +169,7 @@ class Archive_Tar // extends PEAR
     // }}}
 
     /**
-    * OS independant PHP extension load. Remember to take care
+    * OS independent PHP extension load. Remember to take care
     * on the correct extension name for case sensitive OSes.
     * The function is the copy of PEAR::loadExtension().
     *
diff --git a/modules/system/system.test b/modules/system/system.test
index d482afa22..a75153f6a 100644
--- a/modules/system/system.test
+++ b/modules/system/system.test
@@ -1816,7 +1816,7 @@ class TokenReplaceTestCase extends DrupalWebTestCase {
     $result = token_replace($source, array('node' => $node), array('language' => $language, 'clear' => TRUE));
     $result = $this->assertEqual($target, $result, 'Valid tokens replaced while invalid tokens cleared out.');
 
-    // Test without using the clear parameter (non-existant token untouched).
+    // Test without using the clear parameter (non-existent token untouched).
     $target .= '[user:name]';
     $target .= '[bogus:token]';
     $result = token_replace($source, array('node' => $node), array('language' => $language));
diff --git a/scripts/generate-d6-content.sh b/scripts/generate-d6-content.sh
index 5079c2338..fc4c68f96 100644
--- a/scripts/generate-d6-content.sh
+++ b/scripts/generate-d6-content.sh
@@ -75,7 +75,7 @@ for ($i = 0; $i < 24; $i++) {
   $vocabulary['weight'] = $i;
   taxonomy_save_vocabulary($vocabulary);
   $parents = array();
-  // Vocabularies without hierarcy get one term, single parent vocabularies get
+  // Vocabularies without hierarchy get one term, single parent vocabularies get
   // one parent and one child term. Multiple parent vocabularies get three
   // terms: t0, t1, t2 where t0 is a parent of both t1 and t2.
   for ($j = 0; $j < $vocabulary['hierarchy'] + 1; $j++) {
diff --git a/scripts/run-tests.sh b/scripts/run-tests.sh
index 30598233c..429b28b24 100755
--- a/scripts/run-tests.sh
+++ b/scripts/run-tests.sh
@@ -124,7 +124,7 @@ All arguments are long options.
   --clean     Cleans up database tables or directories from previous, failed,
               tests and then exits (no tests are run).
 
-  --url       Immediately preceeds a URL to set the host and path. You will
+  --url       Immediately precedes a URL to set the host and path. You will
               need this parameter if Drupal is in a subdirectory on your
               localhost and you have not set \$base_url in settings.php. Tests
               can be run under SSL by including https:// in the URL.
diff --git a/update.php b/update.php
index ac594ff85..23ffa577f 100644
--- a/update.php
+++ b/update.php
@@ -456,7 +456,7 @@ function update_check_requirements() {
   $output = update_access_denied_page();
 }
 if (isset($output) && $output) {
-  // Explictly start a session so that the update.php token will be accepted.
+  // Explicitly start a session so that the update.php token will be accepted.
   drupal_session_start();
   // We defer the display of messages until all updates are done.
   $progress_page = ($batch = batch_get()) && isset($batch['running']);