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Redirecting just stdout through pipe in bash

Posted on 2006-07-12
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Last Modified: 2008-01-09
With a program I am using when I run this command:

          mycommand | grep hello

I get:

          Running...
         
          Done!
          Well hello there, how are you doing?

But when I run:

          mycommand|grep hello 1> hello.txt

I see:

          Running...
         
          Done!

And then when I cat "hello.txt" I get:

          Well hello there, how are you doing?

...which is what I want to get, but through a pipe (without having to cat the file afterwards).

How can I do this (just get the stdout, but through the pipe instead of on redirection)?  I've seen this in multiple programs.  Also, what category does the "Running..." and "Done!" fit under if not stdout?
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Question by:Autogard
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3 Comments
 
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pjedmond earned 500 total points
ID: 17092775
Running..." and "Done" come under the stderr output. stderr(2) is also used for information that is not 'true output of the program concerned.

What you possibly require is:

mycommand 2>/dev/null | more

(   (()
(`-' _\
 ''  ''



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LVL 22

Expert Comment

by:pjedmond
ID: 17092787
http://www.tldp.org/LDP/abs/html/io-redirection.html

gives a much fully description of what can be done:

(   (()
(`-' _\
 ''  ''

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LVL 8

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by:Autogard
ID: 17092849
Ahah! Exactly. Thanks! I'm using "mycommand 2>/dev/null | grep hello" and it works perfectly!
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