Redirecting standard out/err mid-process?

debuser123 · 08-07-2008, 11:16 AM

Is there a way to redirect stdout/stderr after a process has already started (using bash)? For example,

1) suspend with ctrl+z
2) __fill_in_the_blank__
3) resume with bg or fg

Thanks

unSpawn · 08-08-2008, 06:01 AM

You can attach to a running process with strace but you can't redirect stdout/stderr after a process has already started. If you would have been able to "play" with file descriptors that way then a lot of problems would have ensued where processes expect an fd to be connected to a terminal, file, socket or pipe and not have it changed halfway through to say the bitbucket.

estabroo · 08-08-2008, 11:23 AM

http://etbe.coker.com.au/2008/02/27/...nning-process/

unSpawn · 08-08-2008, 07:52 PM

That's neat.

debuser123 · 08-09-2008, 12:42 AM

Thanks for the link; I didn't think that it would be that involved...I seem to assume that with linux/unix there's always a command to do something...you just need to know what that command is.

But thanks for the info, I could write up a script to accomplish what I've asked. Not sure of the reliability or scalability but it's a start.