testing "grep (exit with error)" "grep nonexistent 2> /dev/null ; echo \$?" \
"1\n" "" ""
-testing "grep (exit success)" "grep grep $0 > /dev/null 2>&1 ; echo \$?" "0\n" \
+testing "grep (exit success)" "grep grep '$0' > /dev/null 2>&1 ; echo \$?" "0\n" \
"" ""
# Test various data sources and destinations