bash and tee processes would be under the same process group number. The
below example is from FreeBSD.
$ sleep 10 | sleep 20 &
[1] 42632
$ ps -ux -o pid,ppid,pgid | grep -E 'sleep|PGID'
USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME
COMMAND PID PPID PGID
XXX 42631 0.0 0.0 13740 2332 7 SC 13:37 0:00.00 sleep
10 42631 42325 42631
XXX 42632 0.0 0.0 13740 2336 7 SC 13:37 0:00.00 sleep
20 42632 42325 42631
XXX 42636 0.0 0.0 13836 2568 7 S+ 13:37 0:00.00 grep -E
sleep|PG 42636 42325 42635
On 5/7/2025 1:27 PM, American Citizen wrote:
Hello:
While the information in the /proc folder for a specific pid will
allow one to find if the output is being sent to stdout or to a file,
I am having problems with a situation where I piped the output to
another command and ran both in the background.
Take, for example
% bash my_bash_script | tee logfile &
Later on I close the terminal in which this command and pipe was
executed and I forgot to memorize what I did.
The pid for my_bash_script can be easily found by pgrep but how can I
recover the "tee logfile" part, so I can examine logfile?
Randall
--
Matt Kowalczyk
