check_open_files.sh

#!/bin/bash
# 
# Inspired by: http://pissedoffadmins.com/nagios/nagios-tomcat-open-files-check.html
#
# Author: Gregor Binder
# Mail: office@wefixit.at

SUDO=/bin/sudo
LSOF=/sbin/lsof
AWK=/bin/awk
WC=/bin/wc

ERROR_CODE=-1
if [ -z "$1" ]; then
    echo "Usage: $0 username"
    echo "  username: Username to check for to much open files"
    exit $ERROR_CODE
else
    USER=$1
fi

function checkExitStatus {
    if [ $1 -ne 0 ]; then
        echo "!!! command failure !!! $2"
        exit -1
    fi
}

# check if the username is valid
$LSOF -u $USER &> /dev/null
checkExitStatus $? "Username wrong"

# check if ah PID is available for the user
PID=`ps -u $USER | tail -1 | awk '{print $1}'`
checkExitStatus $? "No PID found"
OPEN_F=`$SUDO cat /proc/$PID/limits | grep "open files" | awk '{print $5}'`

LSOF=`$SUDO $LSOF -u $USER | $WC -l`
PERCDONE_PRE=$(echo "scale=2;(($LSOF/$OPEN_F) * 100)" |bc)
PERCDONE=`echo $PERCDONE_PRE | cut -d. -f1`

if [ $PERCDONE -lt 84 ]; then
    ERROR_CODE=0
    printf "FILES OK - $PERCDONE %% with $LSOF files open|files=$LSOF;;;\n"
else
    if [ $PERCDONE -ge 85 ] && [ $PERCDONE -le 94 ]; then
        ERROR_CODE=1
    	printf "FILES WARN - $PERCDONE %% with $LSOF files open|files=$LSOF;;;\n"
    elif [ $PERCDONE -ge 95 ]; then
        ERROR_CODE=2
    	printf "FILES CRIT - $PERCDONE %% with $LSOF files open|files=$LSOF;;;\n"
  fi
fi

exit $ERROR_CODE