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Top Forums UNIX for Dummies Questions & Answers Using Grep within a UNIX Script Post 302186846 by Sarahb29 on Friday 18th of April 2008 09:01:50 AM
Old 04-18-2008
Question

Quote:
Originally Posted by sb008
Since you want to add the line "TEST" to the file if the string "lisa" did not occur in the file, it means the return code of grep has to be NON 0 (grep didn't find the string).

If you want to work with the number of times the string occurs you can use the following script.

Code:
#!/usr/bin/ksh

typeset -i xTest
xTest = 'grep -i lisa daily.log | wc -l'

if [ ${xTest} -eq 0 ] 
then
  echo "TEST" >> daily.log
fi

By adding the "| wc -l" the number of occurences is counted.
Hi,

I am doing something very similar to this, only with two scripts - one main script and this little function in another script. The main script calls this grep function multiple times, looking for the word "Error". It gets as far as the grep statement, and then exits the whole program. X is the variable I used to store the result of the grep.

The grep script:
Code:
ls -lt $DEFDIR/outfile
if [ -s $DEFDIR/outfile ]
then
   x=`grep -ci 'Error' $DEFDIR/outfile`
   if [ ${x} -eq 0 ]
   then                       
            echo 'Process successful'
            echo "for Input data $INPUT_FILE"
   else                                             
            echo 'Error in file $INPUT_FILE' 
   fi
fi

So, my standard list for my main script ends up looking like:

+ cd <directory the scripts are in>
+ <execute grep script call>
+ <list the file outfile>
+ [ -s outfile ]
+ + grep -ci Error outfile
x=0
+ echo logout
logout

Script completed with exit code 1

The grep should echo "Process completed successfully" if grep didn't find "Error", but instead it just exits the whole script. I should note that this script used to execute fine until I added the shell specification code #!/bin/ksh -e. I know that the -e forces the script to exit if it finds an error, but if the grep statement passes I do not see where the error could be.

Thanks ahead of time for all your help!
 

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Mail::Mbox::MessageParser::Grep(3pm)			User Contributed Perl Documentation		      Mail::Mbox::MessageParser::Grep(3pm)

NAME
Mail::Mbox::MessageParser::Grep - A GNU grep-based mbox folder reader SYNOPSIS
#!/usr/bin/perl use Mail::Mbox::MessageParser; my $filename = 'mail/saved-mail'; my $filehandle = new FileHandle($filename); my $folder_reader = new Mail::Mbox::MessageParser( { 'file_name' => $filename, 'file_handle' => $filehandle, 'enable_grep' => 1, } ); die $folder_reader unless ref $folder_reader; # Any newlines or such before the start of the first email my $prologue = $folder_reader->prologue; print $prologue; # This is the main loop. It's executed once for each email while(!$folder_reader->end_of_file()); { my $email = $folder_reader->read_next_email(); print $email; } DESCRIPTION
This module implements a GNU grep-based mbox folder reader. It can only be used when GNU grep is installed on the system. Users must not instantiate this class directly--use Mail::Mbox::MessageParser instead. The base MessageParser module will automatically manage the use of grep and non-grep implementations. METHODS AND FUNCTIONS The following methods and functions are specific to the Mail::Mbox::MessageParser::Grep package. For additional inherited ones, see the Mail::Mbox::MessageParser documentation. $ref = new( { 'file_name' => <mailbox file name>, 'file_handle' => <mailbox file handle> }); <file_name> - The full filename of the mailbox <file_handle> - An opened file handle for the mailbox The constructor for the class takes two parameters. The file_name parameter is the filename of the mailbox. The file_handle argument is the opened file handle to the mailbox. Returns a reference to a Mail::Mbox::MessageParser object, or a string describing the error. BUGS
No known bugs. Contact david@coppit.org for bug reports and suggestions. AUTHOR
David Coppit <david@coppit.org>. LICENSE
This software is distributed under the terms of the GPL. See the file "LICENSE" for more information. HISTORY
This code was originally part of the grepmail distribution. See http://grepmail.sf.net/ for previous versions of grepmail which included early versions of this code. SEE ALSO
Mail::Mbox::MessageParser perl v5.10.1 2009-08-09 Mail::Mbox::MessageParser::Grep(3pm)
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