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+#
+# whatis -- and implementation of the 10th Edition Unix sh builtin `whatis'
+# command.
+#
+# usage: whatis arg [...]
+#
+# For each argument, whatis prints the associated value as a parameter,
+# builtin, function, alias, or executable file as appropriate. In each
+# case, the value is printed in a form which would yield the same value
+# if typed as input to the shell itself.
+#
+#
+# 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.
+
+
+whatis()
+{
+ local wusage='usage: whatis arg [arg...]'
+ local fail=0
+
+ if [ $# -eq 0 ] ; then
+ echo "$wusage"
+ return 1
+ fi
+
+ for arg
+ do
+ case $(builtin type -type $arg 2>/dev/null) in
+ "alias")
+ builtin alias "$arg"
+ ;;
+ "function")
+ builtin type "$arg" | sed 1d
+ ;;
+ "builtin")
+ echo builtin "$arg"
+ ;;
+ "file")
+ builtin type -path "$arg"
+ ;;
+ *)
+ # OK, we could have a variable, or we could have nada
+ if [ "$(eval echo \${$arg+set})" = "set" ] ; then
+ # It is a variable, and it is set
+ echo -n "$arg="
+ eval echo '\"'\$$arg'\"'
+ else
+ echo whatis: $arg: not found
+ fail=1
+ fi
+ ;;
+ esac
+ done
+ return $fail
+}