This would be similar to OBS's add text from text file feature - only for a command.
Example:
I run a bat file to extract my current server IP from my dayz config file. It then creates server.txt with the IP and server name.
This "server.txt" file would be linked to my !server command, and show up with the current IP at all times. This eliminates having to update the command with the new server every hour or two.
