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Full Discussion: Diff not working in script
Top Forums Shell Programming and Scripting Diff not working in script Post 302946598 by Junaid Subhani on Wednesday 10th of June 2015 03:45:01 PM
Old 06-10-2015
Diff not working in script
Hi guys,

Let me explain the logic of what I am doing.

I am writing a script that looks into a log file for ERROR statements every 5 minutes and sends out an email containing a new ERROR statement occurring since last run.

The command I am trying to use is :

Code:
 diff --changed-group-format='%>' --unchanged-group-format='' /opt/scripts/server.log.tmp /opt/scripts/server.tmp

The file /opt/scripts/server.tmp is always going to contain the most upto date error messages.
The file /opt/scripts/server.log.tmp contains the errors that were captured during last run of the script.

If I run the above command manually (on command line), it works perfectly.

But when I place it in a script, it does not work.

The complete script is:

Code:
#!/bin/bash

FILTER=ERROR
EXCLUDE="isEmphemeralKeyError:false"
STRING="(ephemeral|expired)"
LIVE_FILE=/opt/app/log/server.log
TMP_FILE=/opt/scripts/server.log.tmp
TMP=/opt/scripts/server.tmp


grep "$FILTER" $LIVE_FILE | grep -v "$EXCLUDE" > $TMP

#Check if a difference is present between new and old file
if diff  $TMP $TMP_FILE > /dev/null
   then
        #Do Nothing
        echo "Error Same"       
        
else

        #Put only the new ERROR messages since last run into $TMP
        diff '--changed-group-format=%>' --unchanged-group-format=''  $TMP_FILE $TMP > $TMP
        
        #Send Email     
        ERROR=`cat $TMP`
        #echo $ERROR
        echo "Error occured on `hostname`
        $ERROR
        * This is an auto-generated email *
        " | mailx -r "noreply@company.com" -s "Error occured on `hostname`" `cat /opt/scripts/email.users`
        
fi

#Copy new logs to old file
cp $TMP $TMP_FILE

Is there is syntax issue in the script and the 2nd diff line ?
Last edited by Junaid Subhani; 06-10-2015 at 04:52 PM..
 

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LEARN ABOUT REDHAT

dbs-edit-patch

DBS-EDIT-PATCH(1)						Debian Build System						 DBS-EDIT-PATCH(1)

NAME

       dbs-edit-patch - Edit a DBS patch

SYNOPSIS

       dbs-edit-patch [options] patch
       dbs-edit-patch -h|--help

DESCRIPTION

       dbs-edit-patch is script to generate or modify patches for Debian source-packages in DBS format.

WARNING

       dbs  is	deprecated,  please  switch  to  the  `3.0 (quilt)' Debian source package format instead. See http://wiki.debian.org/Projects/Deb-
       Src3.0#FAQ for a short guide how to do it.

OPTIONS

       -h, --help
	      Show summary of options.

       -t dir, --tmpdir=dir
	      Directory for the temporary files, default is /tmp or if set $TMP.

       -s dir, --sourcedir=dir
	      Top level directory of the debian-package source-tree, default is the present working directory.

       -P dir, --sourcepatchdir=dir
	      Directory containing upstream patches.

       -T dir, --sourcetardir=dir
	      Directory containing the upstream tarball.

       -p level, --strip=level
	      Striplevel -p of patch (Option -p of diff(1)), accepted values are 0 and 1, default is 0.

ENVIRONMENT VARIABLES

       TMP    Sets the directory for the temporary files, can be overridden with -t dir.

debian/vars
       dbs-edit-patch will automatically use variables defined in the optional debian/vars file.

       When a file debian/vars.in exists and debian/vars either does not exist or is older  than  any  of  the	following  files:  debian/vars.in,
       debian/changelog, debian/rules or debian/control, then dbs-edit-patch will try updating the vars file by running the following command
	   make -f debian/rules -W debian/vars.in debian/vars

EXAMPLES

       Edit the 021_debian patch of Heimdal:

	   ~/heimdal-0.3d> dbs-edit-patch -t/tmp 021_debian
	   Extracting source heimdal-0.3d.tar.gz ... successful.
	   Applying patch 001_replay ... successful.
	   etc.
	   Copying heimdal-0.3d to heimdal-0.3d-old ... successful.
	   Applying patch 021_debian ... successful.

       Edit  files under /tmp/021_debian/heimdal-0.3d as required, then put a short description into /tmp/021_debian/patch-description if desired,
       and finally execute /tmp/021_debian/dbs-update-patch to save the results.

       Technical  note:  dbs-edit-patch  extracts  all	patches  before  021_debian  into  /tmp/021_debian/heimdal-0.3d,  copies  the  result	to
       /tmp/021_debian/heimdal-0.3d-old,  and  applies the last patch 021_debian (if it exists). Also, it creates a shell script which will create
       the diff between the old and new directories:

	   ~/heimdal-0.3d> ls -la /tmp/021_debian
	   total 12
	   -rwxr-xr-x	 1 bam	    users	  112 Jan 31 13:31 dbs-update-patch*
	   -rw-r--r--	 1 bam	    users	    0 Jan 31 13:31 patch-description
	   drwxr-xr-x	14 bam	    users	 4096 Jan 31 13:31 heimdal-0.3d/
	   drwxr-xr-x	14 bam	    users	 4096 Jan 31 13:31 heimdal-0.3d-old/
	   drwxr-xr-x	 5 bam	    users	 4096 Jan 31 13:31 .stampdir/

	   ~/heimdal-0.3d> cat /tmp/021_debian/dbs-update-patch
	   #!/bin/sh -e
	   cd "/tmp/021_debian"
	   HOOK_DIR="/usr/src/heimdal/debian/dbs-hooks"
	   test -d "$HOOK_DIR" && run-parts "$HOOK_DIR" --arg update-patch-prediff
	   find -name "*.bak" -print0 | xargs -0 --no-run-if-empty rm
	   find -name "*~" -print0 | xargs -0 --no-run-if-empty rm
	   : > new_patch
	   test ! -e patch-description || cp patch-description new_patch
	   diff -ruN heimdal-0.3d-old heimdal-0.3d >> new_patch || test $? -eq 1
	   mv new_patch  /usr/src/heimdal/debian/patches/021_debian
	   test -d "$HOOK_DIR" && run-parts "$HOOK_DIR" --arg update-patch-postdiff

SEE ALSO

       diff(1), dbs(7), /usr/share/doc/dbs/

AUTHOR

       DBS was written by Adam Heath, modified by Ben Collins, modified and packaged for Debian by  Brian  May.  This  manpage	was  generated	by
       Andreas Metzler and modified by Robert Luberda.

Debian								February 15th, 2011						 DBS-EDIT-PATCH(1)
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