System administration
Files
An overview of common Linux files and directories and their purpose. Learn why these files exist, file permissions, and other details about them.
Methods to find the Linux distribution and version
Learn how to find the Linux distribution and version of a system. Use the right tool or file to find the relevant details.
Frequently Asked Questions
How to see when a process was started?
Run the ps command and select the relevant columns using the -o option.
ps -o lstart,etimes -p 1234
How to see when the system was started?
Run a tool like uptime or ps to see when the system was started and find out the related uptime.
uptime --since
See all frequently asked questions for System administration