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Functions

intercept stdout/stderr of another process

Terminal - intercept stdout/stderr of another process
strace -ff -e trace=write -e write=1,2 -p SOME_PID
2010-04-20 08:55:54
User: oernii2
Functions: strace
53
intercept stdout/stderr of another process

Alternatives

There are 28 alternatives - vote for the best!

Terminal - Alternatives
strace -ff -e write=1,2 -s 1024 -p PID 2>&1 | grep "^ |" | cut -c11-60 | sed -e 's/ //g' | xxd -r -p
2010-04-23 16:22:17
User: systemj
Functions: cut grep sed strace
10

similar to the previous command, but with more friendly output (tested on linux)

strace -e write=1,2 -p $PID 2>&1 | sed -un "/^ |/p" | sed -ue "s/^.\{9\}\(.\{50\}\).\+/\1/g" -e 's/ //g' | xxd -r -p
2010-10-06 19:37:39
User: glaudiston
Functions: sed strace
3

Useful to recover a output(stdout and stderr) "disown"ed or "nohup"ep process of other instance of ssh.

With the others options the stdout / stderr is intercepted, but only the first n chars.

This way we can recover ALL text of stdout or stderr

Know a better way?

If you can do better, submit your command here.

What others think

Brilliant. Works like a charm on RHEL 4.

Comment by slower 228 weeks and 4 days ago

In ubuntu 14.04

watch ls

Ctr + z sent to suspend

bg %1

diswon %1

sudo strace -ff -e trace=write -e write=1,2 -p 19637

Process 19637 attached

--- stopped by SIGTTOU ---

No output is shown. Any reason?

Comment by udaraliyanage 27 weeks and 2 days ago

Your point of view

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