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Old 06-04-2013, 05:07 PM   #1
MrName
LQ Newbie
 
Registered: Jun 2013
Posts: 3

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Eliminating Stdout and Stderr of Program Receiving EOF Input


Hello all, first time posting here, but spent a lot of time reading the forums. Right now, I am working on a BASH script in which a program is being called, and receiving input via EOF redirection, like so:

Code:
/usr/bin/program << EOF

.....data.....

EOF
This is working just fine, but I want to make the output silent. No matter where I append '> /dev/null 2>&1' I cannot get rid of the stdout or stderr of the actual program being called. It generally causes an error, or has no effect. Is there a way to properly redirect the stdout/stderr of this program? I have tried every possible combination. Any help is greatly appreciated! Thank you!
 
Old 06-04-2013, 05:14 PM   #2
David the H.
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Registered: Jun 2004
Location: Osaka, Japan
Distribution: Debian + kde 4 / 5
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It should work like this:

Code:
/usr/bin/program << EOF >/dev/null 2>&1

.....data.....

EOF
The program has three redirections defined for it. stdin is the heredoc, stdout is /dev/null, and stderr is set to the same place as stdout, also /dev/null.

If that doesn't work for you, and I can't see how it wouldn't, please show us what it's really doing in more detail.

Another possibility is to wrap the whole thing in a program group, function, or subshell and redirect that.
Code:
{
/usr/bin/program << EOF

.....data.....

EOF
} >/dev/null 2>&1
Edit: see here for more on how redirections work:
redirections and file descriptors explained

Last edited by David the H.; 06-04-2013 at 05:15 PM.
 
1 members found this post helpful.
Old 06-04-2013, 05:19 PM   #3
MrName
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Registered: Jun 2013
Posts: 3

Original Poster
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Dude, that was amazingly fast, and a great explanation! Trying right now, and will update this thread. Thank you very much.
 
Old 06-04-2013, 05:22 PM   #4
MrName
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Registered: Jun 2013
Posts: 3

Original Poster
Rep: Reputation: Disabled
Smile

Answer 1 worked like a charm! Thank you very much, not sure how I missed that. You rock!
 
  


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