How to get PIDs connected to another PID's standard input/output/error?
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After something like first_command | … | last_command & $! is set to the PID of last_command. How can I find the other PIDs in this pipeline? Especially, is there a convenient way to find the PID of the second to last command? I can look in /proc/$!/fd/0 and grep for the pipe number in ls /proc/*/fd/1, but that isn't exactly reliable.
bash background-process
asked Mar 18 at 3:57
l0b0l0b0
28.8k20122249
add a comment |
After something like first_command | … | last_command & $! is set to the PID of last_command. How can I find the other PIDs in this pipeline? Especially, is there a convenient way to find the PID of the second to last command? I can look in /proc/$!/fd/0 and grep for the pipe number in ls /proc/*/fd/1, but that isn't exactly reliable.
bash background-process
asked Mar 18 at 3:57
l0b0l0b0
28.8k20122249
Looks like it has been asked before.
– Weijun Zhou
Mar 18 at 5:17
@WeijunZhou I had only read as far as the two first solutions, but the third looks like it would work without changing the commands, which was what I was looking for.
– l0b0
Mar 18 at 6:07
add a comment |
After something like first_command | … | last_command & $! is set to the PID of last_command. How can I find the other PIDs in this pipeline? Especially, is there a convenient way to find the PID of the second to last command? I can look in /proc/$!/fd/0 and grep for the pipe number in ls /proc/*/fd/1, but that isn't exactly reliable.
bash background-process
asked Mar 18 at 3:57
l0b0l0b0
28.8k20122249
After something like first_command | … | last_command & $! is set to the PID of last_command. How can I find the other PIDs in this pipeline? Especially, is there a convenient way to find the PID of the second to last command? I can look in /proc/$!/fd/0 and grep for the pipe number in ls /proc/*/fd/1, but that isn't exactly reliable.
bash background-process
bash background-process
asked Mar 18 at 3:57
l0b0l0b0
28.8k20122249
asked Mar 18 at 3:57
l0b0l0b0
28.8k20122249
asked Mar 18 at 3:57
l0b0l0b0
28.8k20122249
asked Mar 18 at 3:57
l0b0l0b0
28.8k20122249
asked Mar 18 at 3:57
l0b0l0b0
28.8k20122249
28.8k20122249
Looks like it has been asked before.
– Weijun Zhou
Mar 18 at 5:17
@WeijunZhou I had only read as far as the two first solutions, but the third looks like it would work without changing the commands, which was what I was looking for.
– l0b0
Mar 18 at 6:07
add a comment |
Looks like it has been asked before.
– Weijun Zhou
Mar 18 at 5:17
@WeijunZhou I had only read as far as the two first solutions, but the third looks like it would work without changing the commands, which was what I was looking for.
– l0b0
Mar 18 at 6:07
Looks like it has been asked before.
– Weijun Zhou
Mar 18 at 5:17
Looks like it has been asked before.
– Weijun Zhou
Mar 18 at 5:17
@WeijunZhou I had only read as far as the two first solutions, but the third looks like it would work without changing the commands, which was what I was looking for.
– l0b0
Mar 18 at 6:07
@WeijunZhou I had only read as far as the two first solutions, but the third looks like it would work without changing the commands, which was what I was looking for.
– l0b0
Mar 18 at 6:07
add a comment |
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Looks like it has been asked before.
– Weijun Zhou
Mar 18 at 5:17
@WeijunZhou I had only read as far as the two first solutions, but the third looks like it would work without changing the commands, which was what I was looking for.
– l0b0
Mar 18 at 6:07