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+#
+# which - emulation of `which' as it appears in FreeBSD
+#
+# usage: which [-as] command [command...]
+#
+#
+# Chet Ramey <chet.ramey@case.edu>
+#
+# Copyright 1999 Chester Ramey
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# TThis program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+which()
+{
+ local aflag sflag ES a opt
+
+ OPTIND=1
+ while builtin getopts as opt ; do
+ case "$opt" in
+ a) aflag=-a ;;
+ s) sflag=1 ;;
+ ?) echo "which: usage: which [-as] command [command ...]" >&2
+ exit 2 ;;
+ esac
+ done
+
+ (( $OPTIND > 1 )) && shift $(( $OPTIND - 1 ))
+
+ # without command arguments, exit with status 1
+ ES=1
+
+ # exit status is 0 if all commands are found, 1 if any are not found
+ for command; do
+ # if $command is a function, make sure we add -a so type
+ # will look in $PATH after finding the function
+ a=$aflag
+ case "$(builtin type -t $command)" in
+ "function") a=-a;;
+ esac
+
+ if [ -n "$sflag" ]; then
+ builtin type -p $a $command >/dev/null 2>&1
+ else
+ builtin type -p $a $command
+ fi
+ ES=$?
+ done
+
+ return $ES
+}