solaris_check_disk

#!/bin/bash

#
# solaris_check_disk
# Checks specified partition for usage and responds
# with exit code based on warning and critical thresholds
# provided by nagios.
#
# Copyright 2017, Scott Groel, Clemson University ACI

#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

WARNING_T=0
CRITICAL_T=0
PART=""

usage() {
    echo -e '\nExample: "/nagios/remote_disk -w 20 -c 10 -p /'
    echo -e '\n-w <value> Warning threshold\n-c <value> Critical threshold\n-p <partition> Target Partition'	
}

# We expect 3 flags and 3 values for a total of 6 items on commandline
if [[ $# != 6 ]]; then
    /bin/echo "Incorrect input, exiting"
    usage
    exit 3
fi

#Cycle and read in threshold values and target partition
while [[ $# -gt 1 ]]
do
    key="$1"

    case $key in
        -h)
            usage
            exit
        ;;
        -w)
            shift # past argument
            WARNING_T=$1
        ;;
        -c)
            shift
            CRITICAL_T=$1
        ;;
        -p)
            shift # past argument
            PART=$1
        ;;
    esac
    shift
done

#Warning level must be higher than critical. Expected values are for disk space remaining
if [ "$WARNING_T" -lt "$CRITICAL_T" ]; then
	echo "ERROR: Warning threshold lower than Critical Threshold."
	exit 3
fi

#Gather disk stats real quick, using -h for human readable output when reporting space back to user
STATS=$(df -h / | awk '{print $2,$3,$4,$5}' | grep -v Size)
SIZE=$(echo $STATS | awk '{print $1}')
USED=$(echo $STATS | awk '{print $2}')
FREE=$(echo $STATS | awk '{print $3}')
PERCENT=$(echo $STATS | awk '{print $4}')
PERCENT_TR=$(echo $STATS | awk '{print $4}' | tr -d '%')
PERCENT_FREE=$((100 - $PERCENT_TR))

#LOGIC! exit 0 normal, exit 1 warning, exit 2 critica;, exit 3 error
if [ "$PERCENT_FREE" -gt "$WARNING_T" ]; then
	echo "DISK OK; Size=$SIZE, Used=$USED, Free=$FREE; Percentage Used=$PERCENT"
	exit 0
elif [[ "$PERCENT_FREE" -le "$WARNING_T" && "$PERCENT_FREE" -gt "$CRITICAL_T" ]]; then
	echo "DISK WARNING; Size=$SIZE, Used=$USED, Free=$FREE; Percentage Used=$PERCENT"
	exit 1
elif [ "$PERCENT_FREE" -le "$CRITICAL_T" ]; then
	echo "DISK CRITICAL; Size=$SIZE, Used=$USED, Free=$FREE; Percentage Used=$PERCENT"
	exit 2
else
	echo "UNKNOWN ERROR: CONTACT DEVELOPER"
	exit 3
fi