Shell Programming and Scripting

 
#!/bin/ksh
ADMIN="me@somewhere.com"
# set alert level 80% is default
THRESHOLD=80
df | grep -E "Filesystem|tmpfs|cdrom" | awk '{ print $5 " " $1 }' | while read output;
do
  #echo $output
  usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  )
  partition=$(echo $output | awk '{ print $2 }' )
  if [ $usep -ge $THRESHOLD ]; then
    echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" |
     mail -s "Alert: Almost out of disk space $usep" $ADMIN
  fi
done

df | sed -n '2,$s/\(.[^ \t]*\)\(.*\) *\(100%\|[89][0-9]%\)[ \t]*\(.*\)/\1 \3/p' | mail -s "partitions more than 80%" root

df | sed -n '2,$s/\(.[^ \t]*\)\(.*\) *\(100%\|[89][0-9]%\)[ \t]*\(.*\)/\1 \3/p'

df | grep "[89][0-99]%" | awk '{ print $1,"mounted on",$6,"has exceeded 80%"}' | mail -s "partitions more than 80%" user

 
df | grep "[89][0-99]%"