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Full Discussion: capturing line from script output and appending to a file
Top Forums Shell Programming and Scripting capturing line from script output and appending to a file Post 302134228 by ranj@chn on Thursday 30th of August 2007 02:19:53 AM
Old 08-30-2007
one way
One way would be to get pipe the o/p and filter out the last line and get the no of deleted messages from there & assign it to a variable.
Code:
no_of_msgs=$(mailq | grep -v "^[^0-9A-Z]+" | grep MAILER-DAEMON | awk '{print $1}' | postsuper -d - | tail -1 | awk '{print $3}')

Format the date to get the date-time stamp required
Code:
dt_time=$(date +'%Y%m%d %H:%M')

Now echo this to a file where you want to log this.
Code:
echo "$dt_time - ${no_of_msgs}" >>cron_purges

 

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LEARN ABOUT LINUX

zegrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)
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