LinuxGSM comes with a game server send command.
Standard: ./gameserver send your_command_here
Send will send a command to the gameserver, as if it were entered into the console of the gameserver.
A cronjob can be set to run send at any given time.
To edit cronjobs,. type:
crontab -e
A cronjob can be run as the gameserver user or as root, this choice is down to personal preference. Remember to amend the examples to match a specific game server.
Here is an example of a user based cronjob to send a message to a server every hour.
0 * * * * /home/username/gameserver send "Test Message" > /dev/null 2>&1
Here is an example of a root based cronjob to send a message once every hour.
{% hint style="info" %}
The extra su - username -c indicates which user to run the script as.
{% endhint %}
0 * * * * su - username -c '/home/username/gameserver send "Test Message"' > /dev/null 2>&1
crontab.guru is a great resource to generate cronjobs.