Linux piping and loop

Question

Is it possible to create a loop using Linux pipes? For instance.

cmd1 | cmd2 | cmd3 | 'back to stdin cmd1'

In other words, I would like stdoutin to cmd3be connected back to stdinfrom cmd1.

+5

jldupont Jul 07 '12 at 21:52

1 answer

icktoofay · Accepted Answer · 2012-07-07T21:54:13+0000

You can use the named pipe / FIFO:

mkfifo cmd3-to-cmd1
cmd1 < cmd3-to-cmd1 | cmd2 | cmd3 >> cmd3-to-cmd1