Notation for PBS Command Descriptions

We use specific notation rules for PBS commands:

To indicate that an argument is optional, use square brackets. For example, in the qstat man page, the -E option is shown this way:

     qstat [-E]

For an argument that is variable (required but may take more than one value), such as a job ID or vnode name, use angle brackets.
Here's an example from the pbsnodes man page:

     pbsnodes -v <vnode>

To show that something is both optional and variable, use angle brackets inside the square brackets. In this example from the qstat man page, the job ID is optional:

     qstat [<job ID>]

To show that a specific term is a literal (should be used verbatim), put it where it belongs, just as it should be used.
For example, to get the version for a command, you type the command, then "–version":
```
qstat --version
```

Here's a good resource: http://docopt.org