Get stdout from a running program back to screen

Michael99 · 03-03-2008, 01:49 AM

Hello everybody!
I started at home a program in the background using 'setsid <program>'. Now I am at the university and I wanted to see the output the program is writing. Is it somehow possible to know, what the program is writing to stdout (and stderr) at the moment? I forgot to use something like 'setsid <program>|tee ProgOut.txt' or similiar...
Thanks for your help!
Michael

raskin · 03-03-2008, 02:58 AM

I think the best (though also unnatural a bit) is using strace -p. It can be instructed to trace writes to file descriptors 1 and 2, and ‘‘-p [pid]’’ attaches it to already running program. Read its manual, maybe

Code:

strace -f -o log -s 1024 -p $(pgrep program)

will be enough for you.

Michael99 · 03-03-2008, 04:43 AM

Quote:

Originally Posted by raskin

I think the best (though also unnatural a bit) is using strace -p. It can be instructed to trace writes to file descriptors 1 and 2, and ‘‘-p [pid]’’ attaches it to already running program. Read its manual, maybe

Code:

strace -f -o log -s 1024 -p $(pgrep program)

will be enough for you.

Great, thanks a lot!