Script to monitor error in log file

Script to monitor error in log file

#!/bin/bash

#####

# The Script will check the pattern in mentioned file

# Author: Shankar Patel

################################################################################

function help {

echo "The plugin will check the pattern in mentioned file

Usage:

$0 -p <Pattern> -f <file>

Options:

p - Patern to be matched

f - file to monitor given pattern.

h - help.

examples:

$0 -p 'file' -f /var/log/messages

OK. 'file' not found in /var/log/messages | error_found=0"

exit 3;

}

while getopts "p:f:h" OPT; do

case $OPT in

"p") PATTERN=$OPTARG;;

"f") FILE2TAIL=$OPTARG;;

"h") help ;;

esac

done

if [ "$PATTERN" = "" ] || [ "$FILE2TAIL" = "" ] ; then help ; fi

FPATH=$(dirname $FILE2TAIL)

FFILE=$(basename $FILE2TAIL)

INODE_NUM=$(ls -i ${FPATH}/${FFILE} | awk '{ print $1 }')

PATTERN_CODE="$(echo -n "$PATTERN"|tr -d \* | tr -d ' ' | tr -d \. )"

FSIZE_FILE=${FPATH}/.${FFILE}_${PATTERN_CODE}_${INODE_NUM}.size

SIZE_CURRENT=$(ls -l ${FPATH}/${FFILE} | awk '{ print $5 }')

exit_status=0

last_exit()

{# save current size

ls -l ${FPATH}/${FFILE} | awk '{ print $5 }' > ${FSIZE_FILE}

/bin/rm -f /tmp/ts$$ /tmp/tsF$$

exit $exit_status

}

if [ ! -f ${FSIZE_FILE} ]; then

# first time, save line count

echo "OK. saving initial size of ${FPATH}/${FFILE} | error_found=0"

last_exit

fi

# last size is available

SIZE_LAST=$(cat ${FSIZE_FILE})

SIZE_DELTA=$(($SIZE_CURRENT - $SIZE_LAST))

if [ $SIZE_DELTA -gt 0 ]

then

# new bytes to scan

tail "-${SIZE_DELTA}c" ${FPATH}/${FFILE} > /tmp/ts$$

egrep "$PATTERN" /tmp/ts$$ > /tmp/tsF$$

GREP_STATUS=$?

if [ $GREP_STATUS -eq 0 ]

then

echo "CRITICAL. '$PATTERN' found in '${FFILE}' file | error_found=1"

exit_status=2

last_exit

else

# found no matches

echo "OK. '$PATTERN' not found in '${FFILE}' file | error_found=0"

exit_status=0

last_exit

fi

else

# found no matches

echo "OK. '$PATTERN' not found in '${FFILE}' file | error_found=0"

exit_status=0

last_exit

fi