lastcomm

The "lastcomm" command line tool is a part of the Linux operating system's "acct" package. It is used to display information about previously executed commands on the system. When executed, "lastcomm" retrieves and presents data from the system's accounting files. These accounting files contain information such as the command name, username, terminal, start time, and duration of execution for each command executed by users on the system. The tool provides insights into how commands were run on the system and can be useful for various system administration tasks, auditing processes, or investigating user activities. "lastcomm" can be used with various filters and flags to specifically search for particular commands or users, sort data, or limit the output. Lastly, the tool helps in tracking command execution patterns, identifying resource-intensive commands, or monitoring suspicious activities on a Linux system.