Solved

sending the STDOUT and the STDERR to programs in the shell

Posted on 2007-03-29
6
355 Views
Last Modified: 2013-12-26
Sending the STDOUT and the STDERR to programs.

I can do:
 perl -e 'print "aaa\n"; warn "bbb\n"' | perl -ne 'print "   $_"'
 perl -e 'print "aaa\n"; warn "bbb\n"' 2| perl -ne 'print "** $_"'

but I can't do bout:

 perl -e 'print "aaa\n"; warn "bbb\n"' | perl -ne 'print "   $_"'  2| perl -ne 'print "** $_"'


Notice that the important part of the question is:
How to use the | and 2| in the some command line?
0
Comment
Question by:oleber
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
  • 2
6 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 18815885
0
 
LVL 10

Author Comment

by:oleber
ID: 18817225
This isn't a perl question.
the question is:

How to use the | and 2| in the some command line?

Or better, I need the STDOUT to go to one process and the STDERR to another. The perl in this example is just because I'm used to use it, but I can't do it in this project. Just C, the real old C.
0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 18817502
I see.
in the shell as such, you need to use the 2&>1 to get the stderr redirected to the stdout.

as I don't use unix alot, I am not sure where to put that:

 perl -e 'print "aaa\n"; warn "bbb\n"' 2&>1 | perl -ne 'print "   $_"'

 perl -e 'print "aaa\n"; warn "bbb\n"' | perl -ne 'print "   $_"' 2&>1
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 84

Expert Comment

by:ozo
ID: 18827893
(perl -e 'print "aaa\n"; warn "bbb\n"' | perl -ne 'print "   $_"; ') 3>&1 1>&2 2>&3 3>&-  | perl -ne 'print "** $_"'
0
 
LVL 10

Author Comment

by:oleber
ID: 18827954
there is a order problem

The command:
(perl -e 'print "aaa\n"; sleep(1); warn "bbb\n"; sleep(1); warn "ccc\n"' | perl -ne 'print "   $_"; ') 3>&1 1>&2 2>&3 3>&-  | perl -ne 'print "** $_"'

is printing:
** bbb
** ccc
   aaa

in my cygwin.

so it isn't a good solution.

0
 
LVL 84

Accepted Solution

by:
ozo earned 125 total points
ID: 18829162
(perl -e '$|=1; print "aaa\n"; sleep(1); warn "bbb\n"; sleep(1); warn "ccc\n"' | perl -ne 'print "   $_"; ') 3>&1 1>&2 2>&3 3>&-  | perl -ne 'print "** $_"'
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Linux Script to remove files on specific directories with exclusions 31 111
BASH script to modify crontab? 3 114
Excel file not created as expected 7 106
FTP Script 25 87
Over the years I've spent many an hour playing on hardened, DMZ'd servers, with only a sub-set of the usual GNU toy's to keep me company; frequently I've needed to save and send log or data extracts from these server back to my PC, or to others, and…
Background Still having to process all these year-end "csv" files received from all these sources (including Government entities), sometimes we have the need to examine the contents due to data error, etc... As a "Unix" shop, our only readily …
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

738 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question