Linux - How do I see when a process started?

Question

How can I see when a process started, assuming I know the pid. (On Linux)

Answer 1

If you want only the start time, you can select the field and suppress the header by doing this:

 ps -p YOURPID -o lstart=

the output will look like this:

 Mon Dec 14 17:17:16 2009

which is ctime(3) format and you can parse it to split out the relevant parts.

Other start fields such as start, stime, bsdstart and start_time age the time (after 24 hours only the date is shown, for example).

You can, however, use them directly for recently started processes without further parsing:

ps -p YOURPID -o stime=

which would output something like:

09:26

Answer 2

"ps -f" - it's in the man pages

Answer 3

awk '{print $22}' /proc/$pid/stat - gives you the start time in jiffies after boot

Answer 4

one way you can ps -f |grep as you said you the pid other wise you can wise in top also