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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.
#
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
}
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