demultiplexing bash stdout stream

pobbz · 06-20-2007, 08:02 AM

Hello.

I have a simple BASH question: How can I demultiplex output of a command to two separate streams?

What I want to do is to direct the output of a command to a file AND to stdout (I want to both see the output of the command AND store it to a file). It doesn't seem to work, if I, for instance, say

Code:

[user@box]$ ls -la  >output.dat 1>&1

Is there a simple way to accomplish this by stream redirection in BASH?

Thanks.

MensaWater · 06-20-2007, 08:09 AM

Yeppers - use the "tee" command.

ls -la |tee output.dat
Would send to stdout AND to the file output.dat.

ls -la 2>&1 |tee output.dat
Would send both stderr and stdout to stdout AND to the file output.dat.

ls -la | tee -a output.dat
Would send to stdout AND append to the file output.dat.

Type "man tee" for more information on this command.

P.S. Questions with 5 syllable words in the title are seldom viewed as "simple".

pobbz · 06-20-2007, 11:35 PM

Thanks, dude! Just what I was lookin for.

MensaWater · 06-21-2007, 09:14 AM

No problem.

Thanks for the feedback - many newbies never post follow ups so you always wonder if they abducted by aliens after the initial post.