I would like to run a command like `am -help` and get usage information for that command. However, the `-help` parameter does not seem to work on the Process Runtime. How to make this work?

```
cmd1[0] = "/system/bin/sh";
cmd1[1] = "-c";
cmd1[2] = "/system/bin/am -help"  //I want to do sth like this
Process process = Runtime.getRuntime().exec(cmd1);

```

The command works without the `-help`. Is there any way of getting Android Shell commmands' usage information and/or syntaxes? 
**Note that if I don't send `am -help` and just send the command `am` then it automatically returns usage information for that command. Is there any way to invoke that response in any other way?**