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+#
+# An almost-ksh compatible `whence' command. This is as hairy as it is
+# because of the desire to exactly mimic ksh.
+#
+# This depends somewhat on knowing the format of the output of the bash
+# `builtin type' command.
+#
+# Chet Ramey
+# chet@ins.CWRU.Edu
+#
+#
+# Chet Ramey <chet.ramey@case.edu>
+#
+# Copyright 1994 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.
+
+whence()
+{
+ local vflag= path=
+
+ if [ "$#" = "0" ] ; then
+ echo "whence: argument expected"
+ return 1
+ fi
+ case "$1" in
+ -v) vflag=1
+ shift 1
+ ;;
+ -*) echo "whence: bad option: $1"
+ return 1
+ ;;
+ *) ;;
+ esac
+
+ if [ "$#" = "0" ] ; then
+ echo "whence: bad argument count"
+ return 1
+ fi
+
+ for cmd
+ do
+ if [ "$vflag" ] ; then
+ echo $(builtin type $cmd | sed 1q)
+ else
+ path=$(builtin type -path $cmd)
+ if [ "$path" ] ; then
+ echo $path
+ else
+ case "$cmd" in
+ /*) if [ -x "$cmd" ]; then
+ echo "$cmd"
+ fi
+ ;;
+ *) case "$(builtin type -type $cmd)" in
+ "") ;;
+ *) echo "$cmd"
+ ;;
+ esac
+ ;;
+ esac
+ fi
+ fi
+ done
+ return 0
+}