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Path: blob/master/src/scripts/smc-bash-lib
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#!/usr/bin/env bash # various helper functions for bash scripts ### Handling PATH and similar variables ### ### from http://stackoverflow.com/a/24522107 ### # The functions below operate on PATH-like variables whose fields are separated with ':'. # Note: The *name* of the PATH-style variable must be passed in as the 1st # argument and that variable's value is modified *directly*. # SYNOPSIS: path_prepend varName path # Note: Forces path into the first position, if already present. # Duplicates are removed too, unless they're directly adjacent. # EXAMPLE: path_prepend PATH /usr/local/bin path_prepend() { local aux=":${!1}:" aux=${aux//:$2:/:}; aux=${aux#:}; aux=${aux%:} printf -v "$1" '%s' "${2}${aux:+:}${aux}" } # SYNOPSIS: path_append varName path # Note: Forces path into the last position, if already present. # Duplicates are removed too, unless they're directly adjacent. # EXAMPLE: path_append PATH /usr/local/bin path_append() { local aux=":${!1}:" aux=${aux//:$2:/:}; aux=${aux#:}; aux=${aux%:} printf -v "$1" '%s' "${aux}${aux:+:}${2}" } # SYNOPSIS: path_remove varName path # Note: Duplicates are removed too, unless they're directly adjacent. # EXAMPLE: path_remove PATH /usr/local/bin path_remove() { local aux=":${!1}:" aux=${aux//:$2:/:}; aux=${aux#:}; aux=${aux%:} printf -v "$1" '%s' "$aux" } ###