toolrunner should which tool before invoking (#220)

packages/exec/__tests__/scripts/print-args-cmd.cmd

@@ -0,0 +1,12 @@
+@echo off
+setlocal
+set index=0
+
+:check_arg
+set arg=%1
+if not defined arg goto :eof
+set "arg=%arg:"=<quote>%"
+echo args[%index%]: "%arg%"
+set /a index=%index%+1
+shift
+goto check_arg

packages/exec/__tests__/scripts/print-args-sh.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# store arguments in a special array
+args=("$@")
+# get number of elements
+ELEMENTS=${#args[@]}
+
+# echo each element
+for (( i=0;i<$ELEMENTS;i++)); do
+    echo "args[$i]: \"${args[${i}]}\""
+done