installed ls && echo ls installed
installed doesnt-exist && echo doesnt-exist installed
+# which with proper exit codes and no output in case of an error.
+which() {
+ if [ $1 = ls ]; then
+ echo /bin/ls
+ else
+ return 1
+ fi
+}
+echo different which
+installed ls && echo ls installed
+installed doesnt-exist && echo doesnt-exist installed
+
# Tests for generate().
echo "Simple test file for generate() using m4.