Here are some example commands to get you started if you are new to Palo Alto Firewalls:
1) Shows general system health information.
> show system info
2) Shows percent usage of disk partitions. Include the optional files parameter to show information about inodes, which track file storage.
> show system disk-space files
3) Shows the maximum log file size.
> show system logdb-quota
4) Shows running processes.
> show system software status
5) Shows processes running in the management plane.
> show system resources
6) Shows resource utilization in the dataplane.
> show running resource-monitor
7) Shows the licenses installed on the device.
> request license info
8) Shows when commits, downloads, and/or upgrades are completed.
> show jobs processed
9) Shows session information.
> show session info
> show session all
> show session all filter
> show session meter
> show session id session-id
10) Shows information about a specific session.
> show session id <session-id>
11) Shows the running security policy.
> show running security-policy
12) Shows the authentication logs.
> less mp-log authd.log
13) Restarts the device.
> request restart system
14) Shows the administrators who are currently logged in to the web interface, CLI, or API.
> show admins
> show admins all
15) Force logout the administrators who are currently logged in to the web interface, CLI, or API.
>delete admin-sessions username