Shell Programming and Scripting

ALERT=5
function main_prog() {
while read output;
do
#echo $output
  usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1)
  partition=$(echo $output | awk '{print $2}')
  if [ "$usep" -ge "$ALERT" ] ; then
     echo "Running out of space \"$partition ($usep%)\" on system $(hostname), $(date)" 
  fi
done
}
df -H | grep -vE "^Filesystem|tmpfs|cdrom" | awk '{print $5 " " $6}' | main_prog

line 22: [: : integer expression expected
line 22: [: /: integer expression expected
Running out of space "/boot (8%)" on system *.localdomain, Sun Dec  5 16:51:47 EST 2010

ALERT=5
df -k -F ufs |awk -v a=$ALERT 'int($5)>a {print "Running out of space ", $6 , $5 }'