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Bash-Util-Lib - Bash Utility Library

A library of bash utility functions (from output colors to parameter processing) for use in small projects.

Install

The library can be installed using the following methods.

GIT Submodules

If the library is being used inside of a GIT project, then GIT submodules can be utilized. The following commands should be executed from within the root directory of your GIT project.

  • To download the master branch of the library into the ./deps/bash-util-lib directory:

    git submodule add -b master https://github.com/WSI-Services/bash-util-lib.git deps/bash-util-lib

    NOTE: The library branch master and path ./deps/bash-util-lib may be changed to satisfy your projects requirements. To lock in a specific library version, a library tagged release version may be used in lue of the branch name.

  • To change the branch used of the library:

    git submodule set-branch --branch v0.1.1 deps/bash-util-lib

  • To update changes to the library:

    git submodule update --rebase --remote

    Once the submodule is added or updated, make sure to commit changes to your repository.

    git add .gitmodules deps/bash-util-lib
git commit -m 'Added/updated bash-util-lib submodule'

GIT Clone

If you'd rather not use GIT submodules, GIT clone may be used to download the library to the desired location. The following commands should be executed from within the root directory of your GIT project.

  • To download the master branch of the library into the ./deps/bash-util-lib directory:

    git clone -b master https://github.com/WSI-Services/bash-util-lib.git deps/bash-util-lib

    NOTE: The library branch master and path ./deps/bash-util-lib may be changed to satisfy your projects requirements. To lock in a specific library version, a library tagged release version may be used in lue of the branch name.

  • To change the branch used of the library:

    cd deps/bash-util-lib
git checkout v0.1.1

  • To update changes to the library:

    cd deps/bash-util-lib
git pull

Direct Download

If GIT isn't installed, you may download an archive of the library. The following commands should be executed from within the root directory of your project.

  • To download the master branch archive of the library into the project root directory:

    wget https://github.com/WSI-Services/bash-util-lib/archive/master.zip

    NOTE: The library branch master may be changed to satisfy your projects requirements. To lock in a specific library version, a library tagged release version may be used in lue of the branch name.

  • To extract the library archive into the ./deps directory:

    unzip -q master.zip -d deps
rm master.zip
mv deps/bash-util-lib-master deps/bash-util-lib

  • To update changes to the library:

    rm -Rf deps/bash-util-lib

    Perform the download process with the correct branch and the extract process to replace the previous library.

Bash Package

If you have the Bash Package Manager (ie: bpkg) you can download the associated wsi-services/bash-util-lib package:

bpkg install wsi-services/bash-util-lib

Usage

Bash utility functions can be used by sourcing the library file in your script. To access the functions within the library, you should import the main bash library as follows.

source "deps/bash-util/bash-util-lib.sh"

Library Functions

This bash utility library provides functions to simplify writing and running bash scripts. This section lists the available functions and usage of them.

es

Output escape sequence with provided control code if ES_USE environment variable is true

Arguments

Name Type Description
CONTROL_CODE string Argument to pass to escape sequence

Exit Codes

Code Description
0 Command control code output sequence
1 Command control code failed

Standard Out

Specified escape sequence control code

Example:

printf "Message: $(es 1m)%s$(es 0m)\n" "Output Message"

Output:

Message: Output Message

Environment Variables

Variable Default Description
ES_USE true Value as to whether to use escape sequence commands

es_color

Output escape sequence with provided color code for foreground or background

Arguments

Name Type Description
COLOR string escape sequence color integer
FG_BG string Background color if starts with 'b' or foreground if starts with 'f', not specified, or anything else

Exit Codes

Code Description
0 Command control code turned off or failed
1 Command control code turned on and output sequence

Standard Out

Specified escape sequence color code output

Example:

printf "Message: $(es_color 31)%s$(es 0m)\n" "Output Message"

Output:

Message: Output Message

es_color_rgb

Output escape sequence with provided red, green, blue color code for foreground or background

Arguments

Name Type Description
R integer Red color integer
G integer Green color integer
B integer Blue color integer
FG_BG string Background color if starts with 'b' or foreground if starts with 'f', not specified, or anything else

Exit Codes

Code Description
0 Command control code turned off or failed
1 Command control code turned on and output sequence

Standard Out

Specified escape sequence color code output

Example:

printf "Message: $(es_color_rgb 255 0 0)%s$(es 0m)\n" "Output Message"

Output:

Message: Output Message

es_color_hex

Output escape sequence with provided HEX color code for foreground or background

Arguments

Name Type Description
HEX string escape sequence color in HEX
FG_BG string Background color if starts with 'b' or foreground if starts with 'f', not specified, or anything else

Exit Codes

Code Description
0 Command control code turned off or failed
1 Command control code turned on and output sequence

Standard Out

Specified escape sequence color code output

Example:

printf "Message: $(es_color_hex ff0000)%s$(es 0m)\n" "Output Message"

Output:

Message: Output Message

es_attrib

Output escape sequence with provided text attribute control code

Arguments

Name Type Description
CONTROL_CODE string escape sequence text attribute control code
Code Description
strike Strike-through text
hidden Hidden text
swap Swap foreground and background colors
blink Slow blink
underline Underline text
italic Italic text
fait Faint text
bold Bold text
reset Reset text formatting and colors

Exit Codes

Code Description
0 Command control code turned off or failed
1 Command control code turned on and output sequence

Standard Out

Specified escape sequence text attribute control code output

Example:

printf "Message: $(es_attrib bold)%s$(es_attrib reset)\n" "Output Message"

Output:

Message: Output Message

es_erase

Output escape sequence with provided erase control code

Arguments

Name Type Description
CONTROL_CODE string escape sequence erase control code
Code Description
eol Erase from cursor position to end of line
sol Erase from cursor position to start of line
cur Erase the entire current line
bottom Erase from the current line to the bottom of the screen
top Erase from the current line to the top of the screen
clear Clear the screen

Exit Codes

Code Description
0 Command control code turned off or failed
1 Command control code turned on and output sequence

Standard Out

Specified escape sequence text attribute control code output

Example:

printf "Message: %b\n" "Output$(es_erase sol) Message"

Output:

                Message

es_cursor

Output escape sequence with provided cursor control code

Arguments

Name Type Description
CONTROL_CODE string Escape sequence cursor control code
VAL1 integer Optional value for CONTROL_CODE
VAL2 integer Optional value for CONTROL_CODE
Code Description
abs Move cursor to absolute position (LINE;COLUMN)
up Move cursor up N lines (NUM)
down Move cursor down N lines (NUM)
right Move cursor right N columns (NUM)
left Move cursor left N columns (NUM)
save Save cursor position
restore Restore cursor position
home Move cursor to home position (0,0)

Exit Codes

Code Description
0 Command control code turned off or failed
1 Command control code turned on and output sequence

Standard Out

Specified escape sequence cursor control code output

Example:

printf "Message: %b\n" "Output$(es_cursor left 6) Message"

Output:

Message:  Message

nc

Call ncurses tput command with provided arguments if command exists (CMD_TPUT) and NC_USE environment variable is true

Arguments

Name Type Description
@ array Arguments to pass to ncurses command tput

Exit Codes

Code Description
0 Command tput exists and succeeded
1 Command tput missing or failed

Standard Out

Specified ncurses tput output

Example:

printf "Message: $(nc bold)%s$(nc sgr0)\n" "Output Message"

Output:

Message: Output Message

Environment Variables

Variable Default Description
CMD_TPUT $(which tput) Path to tput command utility
NC_USE true Value as to whether to use ncurses commands
NC_BOLD $(nc bold) ncurses command for text bold
NC_UNDERLINE $(nc sgr 0 1) ncurses command for text underline
NC_RESET $(nc sgr0) ncurses command for text reset

nc_color

Output ncurses color code for foreground or background

Arguments

Name Type Description
COLOR string ncurses color in HEX
FG_BG string Background color if starts with 'b' or foreground if starts with 'f', not specified, or anything else

Exit Codes

Code Description
0 Command tput exists
1 Command tput missing

Standard Out

Specified ncurses tput color code output

Example:

printf "Message: $(nc_color 031)%s$(nc sgr0)" "Output Message"

Output:

Message: Output Message

nc_color_from_hex

Output ncurses color index integer from HEX

Arguments

Name Type Description
HEX string HEX color code (RRGGBB) without number sign

Exit Codes

Code Description
0 HEX value provided
1 HEX value not provided

Standard Out

Specified ncurses color index integer

Example:

nc_color_from_hex ff0000

Output:

196

nc_color_hex

Output ncurses color code in HEX for foreground or background

Arguments

Name Type Description
COLOR string ncurses color in HEX
FG_BG string Background color if starts with 'b' or foreground if starts with 'f', not specified, or anything else

Exit Codes

Code Description
0 Command tput exists
1 Command tput missing

Standard Out

Specified ncurses tput color code output

Example:

printf "Message: $(nc_color_hex ff0000)%s$(nc sgr0)" "Output Message"

Output:

Message: Output Message

Environment Variables

Variable Default Description
NC_BLACK $(nc_color_hex 000000) ncurses command for text color black foreground
NC_RED $(nc_color_hex ff0000) ncurses command for text color red foreground
NC_GREEN $(nc_color_hex 00ff00) ncurses command for text color green foreground
NC_YELLOW $(nc_color_hex ffff00) ncurses command for text color yellow foreground
NC_BLUE $(nc_color_hex 0000ff) ncurses command for text color blue foreground
NC_MAGENTA $(nc_color_hex ff00ff) ncurses command for text color magenta foreground
NC_CYAN $(nc_color_hex 00ffff) ncurses command for text color cyan foreground
NC_WHITE $(nc_color_hex ffffff) ncurses command for text color white foreground
NC_BLACK_BG $(nc_color_hex 000000 b) ncurses command for text color black background
NC_RED_BG $(nc_color_hex ff0000 b) ncurses command for text color red background
NC_GREEN_BG $(nc_color_hex 00ff00 b) ncurses command for text color green background
NC_YELLOW_BG $(nc_color_hex ffff00 b) ncurses command for text color yellow background
NC_BLUE_BG $(nc_color_hex 0000ff b) ncurses command for text color blue background
NC_MAGENTA_BG $(nc_color_hex ff00ff b) ncurses command for text color magenta background
NC_CYAN_BG $(nc_color_hex 00ffff b) ncurses command for text color cyan background
NC_WHITE_BG $(nc_color_hex ffffff b) ncurses command for text color white background

exit_err

Output provided error message, optionally additional message, and exit with provided code

Arguments

Name Type Description
ERR_CODE integer Exit code
ERR_MSG string Message to output
ADD_MSG string [OPTIONAL] Additional message to output

Exit Codes

Code Description
? Provided ERR_CODE argument

Standard Error

Provided ERR_CODE and ERR_MSG using the EXIT_ERR_MSG_ERROR format; and optional UTIL_SCRIPT_CMD (if set) using the EXIT_ERR_MSG_COMMAND format

Standard Out

If provided, additional message ADD_MSG using the EXIT_ERR_MSG_ADDITIONAL format

Example:

exit_err 12 "Missing value" "Extra data here"

Output:

Error [12]: Missing value
Extra data here

Environment Variables

Variable Default Description
EXIT_ERR_MSG_ERROR ${NC_RED}Error [${NC_BOLD}%i${NC_RESET}${NC_RED}]${NC_RESET}: ${NC_BOLD}${NC_RED}%b${NC_RESET}\n Variable to store printf style string for error message
EXIT_ERR_MSG_COMMAND ${NC_RED}Command failed${NC_RESET}: ${NC_BOLD}${NC_WHITE}%b${NC_RESET}\n Variable to store printf style string for command string
EXIT_ERR_MSG_ADDITIONAL %s\n Variable to store printf style string for additional string
UTIL_SCRIPT_CMD Variable to hold command string

file_find_line

Output last line number in provided file which matches provided pattern

Arguments

Name Type Description
FILE_NAME string File to scan for pattern
PATTERN string Pattern to scan file for

Exit Codes

Code Description
0 Lines found
1 Lines not found

Standard Out

Line number of last matching line pattern

Example:

file_find_line "/path/to/file.ext" "^#{2}\wSTART:\w${TAG}$"

Output:

24

file_get_lines

Output lines of provided file from provided start line till provided stop line

Arguments

Name Type Description
FILE_NAME string File to clip lines from
START_LINE integer Line number to begin clip
STOP_LINE integer Line number to end clip

Exit Codes

Code Description
0 Lines found
1 Lines not found

Standard Out

Specified lines from file

Example:

file_get_lines "/path/to/file.ext" "24" "26"

Output:

## START: Test
function test { :; }
## STOP: Test

string_expand

Output provided input processed to expand variables

Arguments

Name Type Description
INPUT string Text to evaluate for expansion

Exit Codes

Code Description
0 String expanded
1 String missing

Standard Out

Specified string expanded

Example:

string_expand "Output: \${STRING}"

Output:

Output: Test

file_expand_lines

Output text from section in file specified by provided patterns

Arguments

Name Type Description
FILE_NAME string File to clip lines from
START_PATTERN string Pattern of the start line to output
STOP_PATTERN string Pattern of the stop line to output

Exit Codes

Code Description
0 Lines found and expanded
1 Lines not found

Standard Out

Specified lines from file expanded

Example:

file_expand_lines "/path/to/file.ext" "^#{2}\wSTART:\w${TAG}$" "^#{2}\wSTOP:\w${TAG}$"

Output:

function test { :; }

grab_text_blob

Output text from text blob in file specified by provided blob name

Arguments

Name Type Description
BLOB_NAME string Name of the blob of text to output
FILE_NAME string File to clip lines from

Exit Codes

Code Description
0 Text blob found
1 Text blob not found

Standard Out

Specified text blob from file expanded

Example:

grab_text_blob "BLOB_TEST" "/path/to/file.ext"

Output:

Test text blob

function_exists

Returns status of function existing

Arguments

Name Type Description
FUNCTION_NAME string Name of function to check for

Exit Codes

Code Description
0 Function exists
1 Function does not exist

Standard Out

Example:

function_exists "missing_test"

Exit Code: 1

process_parameters

Process call parameters

Arguments

Name Type Description
PROCESS_ARG_FN string Name of argument process function
PROCESS_OPT_FN string Name of option process function

Exit Codes

Code Description
0 Processing successful
1 Provided arguments processing function does not exist
2 Provided options processing function does not exist
? Processing options function return code

Environment Variables

Variable Default Description
UTIL_ARRAY_SEPARATOR $(printf '\n\t\v') Value to use to separate positional arguments
UTIL_PARAM_POSITIONAL Variable to store positional arguments

Example:

processArgs() {
    ARG1="$1"
    POS_ARG=""
    SHIFT_COUNT=0

    if [[ "${PASS_ARGS}" -gt 0 ]]; then
        POS_ARG="${ARG1}"
        SHIFT_COUNT=$((SHIFT_COUNT+1))
    else
        case "${ARG1}" in
            -a=*|--add=*) # display details for equals-separated option value
                export ARGS_DETAILS="${ARGS_DETAILS}${ARGS_DETAILS:+ }${ARG1#*=}"
                SHIFT_COUNT=$((SHIFT_COUNT+1))
                ;;
            -a|--add)     # display details for space-separated option value
                export ARGS_DETAILS="${ARGS_DETAILS}${ARGS_DETAILS:+ }$2"
                SHIFT_COUNT=$((SHIFT_COUNT+2))
                ;;
            -l|--list)    # list all
                export LISTING=1
                SHIFT_COUNT=$((SHIFT_COUNT+1))
                ;;
            --)           # pass following arguments
                export PASS_ARGS=1
                SHIFT_COUNT=$((SHIFT_COUNT+1))
                ;;
            *)            # unknown argument
                POS_ARG="${ARG1}"
                SHIFT_COUNT=$((SHIFT_COUNT+1))
                ;;
        esac
    fi

    if [[ -n "$POS_ARG" ]]; then
        # save argument in an array for later
        export UTIL_PARAM_POSITIONAL="${UTIL_PARAM_POSITIONAL}${UTIL_PARAM_POSITIONAL:+${UTIL_ARRAY_SEPARATOR}}${POS_ARG}"
    fi

    return "${SHIFT_COUNT}"
}

dispatchCommand() {
    COMMAND="$1"
    [[ $# -gt 0 ]] && shift

    case "${COMMAND}" in
        commands) command_commands "${@}" ;;
        version)  command_version  "${@}" ;;
        help|*)   command_help     "${@}" ;;
    esac
}

process_parameters "processArgs" "dispatchCommand" "${@}"

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Bash Utility Library

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shell bash cli utility library lib util utility-library

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