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149 lines
3.1 KiB
Bash
149 lines
3.1 KiB
Bash
#
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# PATH Helpers
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#
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# A few useful functions to manipulate the PATH environment variable. Use,
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# modify, copy, steal, plunder these functions to your hearts content, at
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# your own risk of course :) --jimeh
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#
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# Print PATH as a newline separated list.
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#
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# Example:
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#
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# $ echo $PATH
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# /usr/bin:/usr/local/bin
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# $ path_list
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# /usr/bin
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# /usr/local/bin
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#
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path_list () {
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echo -n "$PATH" | tr ":" "\n"
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}
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# Append specified path to the end of PATH.
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#
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# Takes one argument:
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# - $1: path to add
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#
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# If $1 already exists it is first removed, and then added to the end of PATH.
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#
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# Example:
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#
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# $ echo $PATH
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# /usr/bin:/usr/local/bin
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# $ path_append "/usr/sbin"
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# $ echo $PATH
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# /usr/bin:/usr/local/bin:/usr/sbin
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#
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path_append () {
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if [ ! -n "$1" ]; then return 2; fi
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path_remove "$1"
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export PATH="$PATH:$1"
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}
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# Prepend specified path to the begnning of PATH.
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#
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# Takes one argument:
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# - $1: path to add
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#
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# If $1 already exists it is first removed, and then added to the beginning of
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# PATH.
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#
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# Example:
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#
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# $ echo $PATH
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# /usr/bin:/usr/local/bin
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# $ path_prepend "/usr/sbin"
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# $ echo $PATH
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# /usr/sbin:/usr/bin:/usr/local/bin
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#
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path_prepend () {
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if [ ! -n "$1" ]; then return 2; fi
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path_remove "$1"
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export PATH="$1:$PATH"
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}
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# Remove specified path from PATH.
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#
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# Takes one argument:
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# - $1: path to remove
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#
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# Example:
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#
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# $ echo $PATH
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# /usr/bin:/usr/local/bin
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# $ path_remove "/usr/local/bin"
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# $ echo $PATH
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# /usr/bin
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#
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path_remove () {
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if [ ! -n "$1" ]; then return 2; fi
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if [[ ":$PATH:" == *":$1:"* ]]; then
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export PATH=$(__path_clean `echo -n ":$PATH:" | sed "s;:$1;;"`)
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return 0
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fi
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return 1
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}
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# Add a path to PATH before another path.
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#
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# Takes two arguments:
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# - $1: path to add
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# - $2: target path to add $1 before
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#
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# If $1 already exists in PATH it is first removed, and then added before $2.
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#
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# Example:
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#
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# $ echo $PATH
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# /usr/bin:/usr/local/bin
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# $ path_add_before "/usr/local/sbin" "/usr/local/bin"
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# $ echo $PATH
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# /usr/bin:/usr/local/sbin:/usr/local/bin
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#
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path_add_before () {
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if [ ! -n "$1" ] || [ ! -n "$2" ]; then return 2; fi
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if [[ ":$PATH:" == *":$2:"* ]]; then
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path_remove "$1"
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export PATH=$(__path_clean `echo -n ":$PATH:" | sed "s;:$2;:$1:$2;"`)
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return 0
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fi
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return 1
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}
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# Add a path to PATH after another path.
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#
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# Takes two arguments:
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# - $1: path to add
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# - $2: target path to add $1 after
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#
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# If $1 already exists in PATH it is first removed, and then added after $2.
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#
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# Example:
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#
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# $ echo $PATH
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# /usr/bin:/usr/local/bin
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# $ path_add_before "/usr/local/sbin" "/usr/local/bin"
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# $ echo $PATH
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# /usr/bin:/usr/local/bin:/usr/local/sbin
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#
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path_add_after () {
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if [ ! -n "$1" ] || [ ! -n "$2" ]; then return 2; fi
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if [[ ":$PATH:" == *":$2:"* ]]; then
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path_remove "$1"
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export PATH=$(__path_clean `echo -n ":$PATH:" | sed "s;:$2;:$2:$1;"`)
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return 0
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fi
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return 1
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}
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# Strips first and last character from intput string.
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#
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# Example:
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# __path_clean ":/bin:/usr/bin:" #=> /bin:/usr/bin
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#
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__path_clean () {
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echo -n "$1" | sed "s/.\(.*\)./\1/"
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}
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