#!/bin/sh

# Output warnings if a given file system is not mounted.
# Oftentimes, this could be due to a network issue or
# a hard disk failure.

# Pass the name of the file system or the mount point
# as the first command-line argument.
filesystem=$1

df "$filesystem" > /dev/null 2&>1
result=$?

if [ "$result" == 0 ]
then
    entry=`df -k $filesystem | tail -1`  

    # Split out the amount of space free as well as in-use percentage.
    free=`echo $entry | cut -d' ' -f4`
    in_use=`echo $entry | cut -d' ' -f5 | cut -d'%' -f1 `

    echo "Filesystem $filesystem is $in_use% used with $free KB free."
else
    echo "ERROR: Filesystem $filesystem not found."
fi