#!/bin/ksh
#
# get_fs_util - Get the percentage of filesystem utilization and send an alert
#               if the threshold is exceeded.
#
# version 0.07
#
# Shane O'Neal (soneal@cisco.com), 4/4/2001
#
# This script was tested on Solaris 2.6 and should run without
# modification on newer versions of Solaris. Use on other platforms
# will require modification.
#
# Release Notes:
#
# 0.07 - Added parameterization to utility for threshold, recipients
#        and file systems.  You must pass in a file system.  If no recipients
#        passed in, no email is sent.  If no threshold is passed in, a default
#        of 80% is used.  Also added to printing of info to standard output.
# 0.06 - Fixed erroneous alerts with filesystems that do not exist.
# 0.05 - Fixed erroneous alerts with filesystems less than 10% full.
#        The script ignores directories which do not exist.
# 0.04 - Added syslog functionality and PATH statement.
# 0.03 - The script no longer ignores filesystems that are 100% full.
#
# Directions:
#
# 1) Place this script in /usr/local/bin and make it executable:
#
#    chmod 755 /usr/local/bin/get_fs_util
#
# 2) Modify the variables below to set the email RECIPIENTS, FILESYSTEMS
#    to be monitored (separated by a space if there are more than one),
#    filesystem utilization percentage THRESHOLD and syslog FACILITY.
#
# 3) Add a line to root's crontab similar to the following:
#
#    0,15,30,45 * * * * /usr/local/bin/get_fs_util >/dev/null 2>&1
#
#    In this example, this script will run every 15 minutes.
#
#    NOTE: The script does not have to be run by root. It can be run by
#          any user.
#
# 4) To test the script, change the THRESHOLD to a value lower than the
#    current utilized capacity, as reported by "df -k", and run the script
#    from the command line.
#

# User modifiable variables:

THRESHOLD="85%"              # Use a leading 0 if < 10% (ie. 09% rather than 9%)
FACILITY="local7.err"
USAGE="$0 [-t N] [-r Recipient List] mount_points..."
RECIPIENTS="michael.pareene@setgetweb.com"

while getopts ":t:r:" opt; do
  case $opt in
    t ) THRESHOLD=$OPTARG ;;
    r ) RECIPIENTS=$OPTARG ;;
    * ) echo $USAGE
         exit 1 ;;
  esac

done

shift $(($OPTIND - 1))

FILESYSTEMS=$*

if [ -z $FILESYSTEMS ]; then
  echo $USAGE
  exit 1
fi

# Do not modify anything below this line:
PATH=/usr/bin:/usr/sbin:/bin:/usr/lib
HOSTNAME=$(hostname | tr '[a-z]' '[A-Z]')
for FS in $FILESYSTEMS
do
UTILIZED=""
if [[ -d $FS ]]; then
        UTILIZED=$(df -k $FS | tail -1 | awk '{print $5}')
fi
if [[ "$UTILIZED" = [0-9]% ]]; then
        UTILIZED="0$UTILIZED"
fi
SUBJECT="Filesystem $FS on $HOSTNAME is $UTILIZED full!"
MESSAGE="$SUBJECT Threshold is $THRESHOLD. Immediate System Administrator intervention is required."

# Define the alert function:
alert ()
{
  echo $MESSAGE
  logger -p $FACILITY -t get_fs_util \
  "$FS is $UTILIZED full. Threshold is $THRESHOLD."

  if [ ! -z $RECIPIENTS ]; then
    echo $MESSAGE | mail -s "$SUBJECT" "$RECIPIENTS"
  fi
}

# Compare the utilized value against the threshold:
if [[ "$UTILIZED" > "$THRESHOLD" || "$UTILIZED" = "100%" ]]; then
        alert
fi

done

exit 0