How to find uptime of a linux process

Question

How do I find the uptime of a given linux process.

ps aux | grep gedit | grep -v grep

gives me a whole lot of information which includes the time at which the process was started. I am specifically looking for switch which returns the uptime of a process in milliseconds.

Thanks

Answer 1

ps -o "cputime=" $pid

See "Standard format specifiers" in the ps manual page.

(The = character in -o causes the header to be disabled.)