diff --git a/scripts/alltools.tcl b/scripts/alltools.tcl
index 78b901fe9..58b50bdce 100644
--- a/scripts/alltools.tcl
+++ b/scripts/alltools.tcl
@@ -23,6 +23,8 @@
 # Souperman 05Nov2002: added ordnumber
 # Tothwolf  27Dec2003: added matchbotattrany, optimized ordnumber,
 #                      more minor changes
+# CrazyCat  18Oct2022: added achannels
+# CrazyCat  31Jan2024: added lintersect and ldiff
 #
 ########################################
 #
@@ -100,6 +102,9 @@
 # killdccbut <idx>
 #   kill all dcc user connections except for the given idx
 #
+# achannels [flag]
+#   return channels with flag enabled
+#   if channels is empty, return channel list
 #
 ##
 ## (moretools):
@@ -123,6 +128,11 @@
 #   if the given number is between 1 and 15, return its text representation
 #   else return the number given
 #
+# lintersect <list1> <list2>
+#   returns a list of all elements in list1 that are present in list2
+#
+# ldiff <list1> <list2>
+#   returns a list of all elements in list1 which are not in list2
 #
 ##
 ## (other commands):
@@ -380,6 +390,16 @@ proc number_to_number {number} {
   }
 }
 
+proc lintersect {list1 list2 {option -exact}} {
+   if {$option ne "-nocase"} { set option -exact }
+   return [lmap x $list1 {expr {[lsearch $option $list2 $x] >= 0 ? $x : [continue]}}]
+}
+ 
+proc ldiff {list1 list2 {option -exact}} {
+   if {$option ne "-nocase"} { set option -exact }
+   return [lmap x $list1 {expr {[lsearch $option $list2 $x] < 0 ? $x : [continue]}}]
+}
+
 #
 # other commands:
 #
@@ -437,3 +457,20 @@ proc ordnumber {string} {
   }
   return $string
 }
+
+proc achannels {{attr ""}} {
+  set achans {}
+  if {$attr eq ""} {
+    set achans [channels]
+  } else {
+    if {[catch {set atype [chansettype $attr]}]} { set atype "unknow" }
+    if {$atype ne "flag"} {
+      throw {TCL ATTRUNK "$attr is unknown or not flag attribute"} "$attr is unknown or not flag attribute"
+      return
+    }
+    foreach c [channels] {
+      if {[channel get $c $attr]} { lappend achans $c }
+    }
+  }
+  return $achans
+}