There are various CLI commands that are available to the contestants. Read about them here.
There are various commands that are executed around contest time. They are automated via scheduling, but some can be manually executed, too. Read about them here.
During the contest, when something unexpected happens, we might want to disable VPN and/or disable the firewall. See how here.
All IOI-related commands will create logs to local0 facility. These logs will also be stored in /opt/ioi/store/log/local.log in the contestant VM.