46 lines
1.2 KiB
Text
46 lines
1.2 KiB
Text
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#From: "Simon J. Gerraty" <sjg@zen.void.oz.au>
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#Message-Id: <199510091130.VAA01188@zen.void.oz.au>
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#Subject: Re: a shell idea?
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#Date: Mon, 09 Oct 1995 21:30:20 +1000
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# NAME:
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# add_path.sh - add dir to path
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#
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# DESCRIPTION:
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# These functions originated in /etc/profile and ksh.kshrc, but
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# are more useful in a separate file.
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#
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# SEE ALSO:
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# /etc/profile
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#
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# AUTHOR:
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# Simon J. Gerraty <sjg@zen.void.oz.au>
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# @(#)Copyright (c) 1991 Simon J. Gerraty
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#
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# This file is provided in the hope that it will
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# be of use. There is absolutely NO WARRANTY.
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# Permission to copy, redistribute or otherwise
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# use this file is hereby granted provided that
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# the above copyright notice and this notice are
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# left intact.
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# is $1 missing from $2 (or PATH) ?
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no_path() {
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eval "case :\$${2-PATH}: in *:$1:*) return 1;; *) return 0;; esac"
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}
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# if $1 exists and is not in path, append it
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add_path () {
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[ -d ${1:-.} ] && no_path $* && eval ${2:-PATH}="\$${2:-PATH}:$1"
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}
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# if $1 exists and is not in path, prepend it
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pre_path () {
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[ -d ${1:-.} ] && no_path $* && eval ${2:-PATH}="$1:\$${2:-PATH}"
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}
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# if $1 is in path, remove it
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del_path () {
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no_path $* || eval ${2:-PATH}=`eval echo :'$'${2:-PATH}: |
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sed -e "s;:$1:;:;g" -e "s;^:;;" -e "s;:\$;;"`
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}
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