make which2.sh script more robust

which.spec

@@ -1,7 +1,7 @@
 Summary: Displays where a particular program in your path is located
 Name: which
 Version: 2.21
-Release: 32%{?dist}
+Release: 33%{?dist}
 License: GPLv3
 Source0: http://ftp.gnu.org/gnu/which/%{name}-%{version}.tar.gz
 Source1: which2.sh
@@ -41,6 +41,9 @@ rm -f $RPM_BUILD_ROOT%{_infodir}/dir
 %{_mandir}/man1/which.1*
 
 %changelog
+* Wed Feb 09 2022 Than Ngo <than@redhat.com> - 2.21-33
+- make which2.sh script more robust,
+
 * Sat Jan 22 2022 Fedora Release Engineering <releng@fedoraproject.org> - 2.21-32
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild
 

which2.sh

@@ -20,7 +20,7 @@ bash|sh)
     ;;
 esac
 
-which () {
+function which {
     (alias; eval ${which_declare}) | /usr/bin/which --tty-only --read-alias --read-functions --show-tilde --show-dot $@
 }