Finding out what a process is doing

[Ian Petersen]

On 3/29/07, Lennart Sorensen <lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org> wrote:
> Does ptrace work on an alreadying running process?  I know strace has to
> be run with a process.  lsof certainly can be useful, although cpu use is
> often not based on file accesses.

You can run strace like this:

strace -p <pid>

and it will attach to the given (already running) pid.  You might have
to be root to do that.

Ian

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