last will and testament
Not a standard Linux term; may refer colloquially to a user's final configuration files or documented system setup before departure, or humorously to critical system documentation left behind.
This phrase is not an official Linux concept, but rather informal jargon used in system administration contexts. It typically refers to important documentation, configuration backups, or setup notes that a departing system administrator leaves behind for their successor.
In practice, this might include commented configuration files, runbooks for critical processes, lists of installed software, cron job schedules, or notes about system quirks and workarounds. For example, a sysadmin might create a file called /root/SYSADMIN_NOTES.txt documenting custom patches, security rules, and emergency procedures.
The term is sometimes used humorously when referring to .bashrc or .profile customizations, shell aliases, or SSH key documentation that explains "how to keep this system running" after the original administrator leaves.