Add current date/time to ps output

by Bastien   Last Updated December 06, 2018 15:02 PM - source

I want to log my cpu and memory usage. There are loads of posts out there giving different options using ps, top, python, etc. I really like the ps way of doing it. In my case, I call:

ps -o user -o pid  -o pmem -o pcpu -u dxd9163

Which gives a nice table:

enter image description here

Because I'm logging this data (every ten minutes), I would like to add the date/time information to each row of the table as with:

date +%Y/%m/%d/%H:%M

I don't want the process time, how long it was running or when it was started, I just want the time the snapshot was taken. So in the figure above, a new field, time would be there with all the same info for each snapshot.

It seems the ps function has a deprecated option that may have worked before but doesn't anymore (utime).

Any idea how to do this? It's probably easy but I'm new to Linux.

My final goal is to log every 10 minutes for as long at it takes into a usage.txt file ram and cpu usage for my user.

Tags : log ps

Answers 1

One trick is to replace each "start of line" with "start of line, timestamp ":

ps -o user -o pid  -o pmem -o pcpu -u dxd9163 | sed "s#^#$(date +%Y/%m/%d/%H:%M) #"

Usually sed's substitute operator uses a slash as separator (s/…/…/) but since the timestamp already contains slashes, this won't work. I thus used a different separator (s#…#…#).

December 06, 2018 14:38 PM

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