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Old 12-26-2005, 11:58 AM   #1
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Howto get the output of a running process using ssh?

Hello, i would like to know if i can log or view the output of a running process, using ssh?
Old 12-26-2005, 12:34 PM   #2
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can you explain in some useful detail what you actually want to achieve?? i would assume that ssh and the contents of a process on a remote system are utterly irrelevant to one another. 1) get to remote system 2) look at whateveter it is you want... so probably ignore the first part and tell us what you actually mean for the second.
Old 12-26-2005, 01:04 PM   #3
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Originally Posted by agouz
Hello, i would like to know if i can log or view the output of a running process, using ssh?
If you just want to log an ssh session that you invoke:

$ ssh -l login_name machine_name 2>&1 | tee ssh_logfile.txt

Graphical ssh clients (like Putty) may have session logging built in, but I've never looked for that so I don't know for sure.

Do you mean you want to invoke ssh, and then attach to an already running process on the remote machine and see what it's writing to stdout and/or stderr? You can use "truss" to see what's going on with a running process, but that shows the low level calls, not just stdout/stderr. You have to own the process (or be root) to do this. You could also try snooping around in /proc. I don't think you can grab only stdout/stderr from there, but I could very well be wrong on that. Again, you will either need to own the process or be root to see details under /proc.

If you mean the simpler "start a process and send it's output to a logfile":

$ program_name 2>&1 >logfile.txt view and log at the same time:

$ program_name 2>&1 | tee logfile.txt
Old 12-26-2005, 01:11 PM   #4
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I would like to view the output of a running process. The process is running in a tty and the output of the process is in the stdout. How can i view the output (without restarting the process) from an another tty (i can't use myproc > /dev/pts/x because i don't want to restart the process).
thanks in advance.


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