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Full Discussion: Regarding Redirecting a command's default error message in script
Top Forums Shell Programming and Scripting Regarding Redirecting a command's default error message in script Post 302491444 by raj100 on Thursday 27th of January 2011 12:46:34 PM
Old 01-27-2011
Question Regarding Redirecting a command's default error message in script
Hi,

I just need a small help. I have this simple script to check a huge list of IDs if they exist or not on a server. Before running I have tested it with only 5-6 IDs. Script works fine.
But what I need it should not display the message of command's error message. That means if suppose an ID in the file "list" does not exist on server then it should display only "$i Does not exist". Can anyone please let me know how can I redirect the command's default message to /dev/null so that I can only see my error message?
Code:
for i in `cat list`
do
  id $i > /dev/null
  if [ `echo $?` -eq 0 ]; then
    echo "ID $i exists"
  elif [ `echo $?` -eq 1 ]; then
    echo "$i Does not exist" 
  else
    echo "Error"
  fi
done

I just want to know that. Suppose I have only 2 IDs on in the file "list" isctm91 & iscts30. When I ran the above script it displays messages like this,
Code:
$>sh chk.sh

User not found in /etc/passwd file    # <== Now this message is the default error message
                                      # through the command "id $i". I don't want to see this on terminal.
isctm91 Does not exist                # <== I just want to see this message.
User not found in /etc/passwd file    # <== this message don't want to see on terminal
iscts30 Does not exist                # <==I just wzant to see this message.

OS I am working is AIX.
Please let me know.
Last edited by Scott; 01-27-2011 at 02:00 PM.. Reason: Added code tags, indentation
 

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LEARN ABOUT CENTOS

test::script

Test::Script(3) 					User Contributed Perl Documentation					   Test::Script(3)

NAME

       Test::Script - Basic cross-platform tests for scripts

DESCRIPTION

       The intent of this module is to provide a series of basic tests for 80% of the testing you will need to do for scripts in the script (or
       bin as is also commonly used) paths of your Perl distribution.

       Further, it aims to provide this functionality with perfect platform-compatibility, and in a way that is as unobtrusive as possible.

       That is, if the program works on a platform, then Test::Script should always work on that platform as well. Anything less than 100% is
       considered unacceptable.

       In doing so, it is hoped that Test::Script can become a module that you can safely make a dependency of all your modules, without risking
       that your module won't on some platform because of the dependency.

       Where a clash exists between wanting more functionality and maintaining platform safety, this module will err on the side of platform
       safety.

FUNCTIONS

   script_compiles
	   script_compiles( 'script/foo.pl', 'Main script compiles' );

       The "script_compiles" test calls the script with "perl -c script.pl", and checks that it returns without error.

       The path it should be passed is a relative unix-format script name. This will be localised when running "perl -c" and if the test fails the
       local name used will be shown in the diagnostic output.

       Note also that the test will be run with the same perl interpreter that is running the test script (and not with the default system perl).
       This will also be shown in the diagnostic output on failure.

   script_runs
	   script_runs( 'script/foo.pl', 'Main script runs' );

       The "script_runs" test executes the script with "perl script.pl" and checks that it returns success.

       The path it should be passed is a relative unix-format script name. This will be localised when running "perl -c" and if the test fails the
       local name used will be shown in the diagnostic output.

       The test will be run with the same perl interpreter that is running the test script (and not with the default system perl). This will also
       be shown in the diagnostic output on failure.

SUPPORT

       All bugs should be filed via the bug tracker at

       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Script>

       For other issues, or commercial enhancement and support, contact the author.

AUTHOR

       Adam Kennedy <adamk@cpan.org>

SEE ALSO

       prove, <http://ali.as/>

COPYRIGHT

       Copyright 2006 - 2009 Adam Kennedy.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.16.3							    2009-11-24							   Test::Script(3)
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