How to list pipes used by a process with a bash command

Question

Is there a way to list pipes used by a running linux process (e.g. given its pid or process name) and to determine their used capacity?

Something like:

lspipes -l -p pid

resulting in something like:

[rw]  descriptor  size  name

where rw is the pipe end type and size is its used capacity

Or something similar

score 16 · Accepted Answer · edited Aug 13 '15 at 02:01

1) ls -l /proc/pid/fd

This will list the pipes

lr-x------ 1 prabagaran prabagaran 64 Sep  5 23:01 14 -> pipe:[57729]
l-wx------ 1 prabagaran prabagaran 64 Sep  5 23:01 15 -> pipe:[57728]
lr-x------ 1 prabagaran prabagaran 64 Sep  5 23:01 16 -> pipe:[57731]
lr-x------ 1 prabagaran prabagaran 64 Sep  5 23:01 17 -> pipe:[57730]

2) lsof | grep 57731

wineserve 3641 prabagaran   76w     FIFO        0,8       0t0   57731 pipe
winedevic 3651 prabagaran   16r     FIFO        0,8       0t0   57731 pipe

These are the pipe information related to the given process id.

score 3 · Answer 2 · edited Apr 21 '22 at 16:38

3

I don't really think there's such a command. You can try the following:

lsof -p <PID> | grep "FIFO"

Where <PID> stand for the process id. Probably there's a lsof switch to select only pipes and avoiding the grep, but I cannot find it in the man page right now.

It should give you something close to what you're looking for.

edited Apr 21 '22 at 16:38

Iain Samuel McLean Elder

19,791
12
64
80

answered Sep 05 '12 at 15:55

Zagorax

11,440
8
44
56

5

FIFO [stands for "First In, First Out"](http://www.linuxjournal.com/article/2156) – TML Feb 20 '14 at 20:45
1

@TML, I know... But he didn't need to change it in the command as he's supposed to do with PID!:D that's what I meant! – Zagorax Feb 20 '14 at 21:42
@Zagorax I attempted tp clear that up by quoting the literal string and and using pointy brackets for the metasyntactic variable. – Iain Samuel McLean Elder Apr 21 '22 at 16:42

How to list pipes used by a process with a bash command

2 Answers2