| 1 | #From: "Simon J. Gerraty" <sjg@zen.void.oz.au>
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| 2 | #Message-Id: <199510091130.VAA01188@zen.void.oz.au>
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| 3 | #Subject: Re: a shell idea?
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| 4 | #Date: Mon, 09 Oct 1995 21:30:20 +1000
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| 5 |
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| 6 |
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| 7 | # NAME:
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| 8 | # add_path.sh - add dir to path
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| 9 | #
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| 10 | # DESCRIPTION:
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| 11 | # These functions originated in /etc/profile and ksh.kshrc, but
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| 12 | # are more useful in a separate file.
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| 13 | #
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| 14 | # SEE ALSO:
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| 15 | # /etc/profile
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| 16 | #
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| 17 | # AUTHOR:
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| 18 | # Simon J. Gerraty <sjg@zen.void.oz.au>
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| 19 |
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| 20 | # @(#)Copyright (c) 1991 Simon J. Gerraty
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| 21 | #
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| 22 | # This file is provided in the hope that it will
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| 23 | # be of use. There is absolutely NO WARRANTY.
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| 24 | # Permission to copy, redistribute or otherwise
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| 25 | # use this file is hereby granted provided that
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| 26 | # the above copyright notice and this notice are
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| 27 | # left intact.
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| 28 |
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| 29 | # is $1 missing from $2 (or PATH) ?
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| 30 | no_path() {
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| 31 | eval "case :\$${2-PATH}: in *:$1:*) return 1;; *) return 0;; esac"
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| 32 | }
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| 33 | # if $1 exists and is not in path, append it
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| 34 | add_path () {
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| 35 | [ -d ${1:-.} ] && no_path $* && eval ${2:-PATH}="\$${2:-PATH}:$1"
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| 36 | }
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| 37 | # if $1 exists and is not in path, prepend it
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| 38 | pre_path () {
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| 39 | [ -d ${1:-.} ] && no_path $* && eval ${2:-PATH}="$1:\$${2:-PATH}"
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| 40 | }
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| 41 | # if $1 is in path, remove it
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| 42 | del_path () {
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| 43 | no_path $* || eval ${2:-PATH}=`eval echo :'$'${2:-PATH}: |
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| 44 | sed -e "s;:$1:;:;g" -e "s;^:;;" -e "s;:\$;;"`
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| 45 | }
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