Simple space monitor - results sorted by % used

#!/bin/ksh
##################################################################### 
# TITLE:     uxspace
# AUTHOR:    Adam Forrest
# DATE:      March 2002 
# USAGE:     Sorts filesystem usage by % space or inodes used
##################################################################### 

me=`basename $0`
HDR1="Unix Filesystems by Space Usage (Kb)"
HDR2="===================================="                   
HDR3="\nFilesystem                      %Used Capacity     Used     Free"
EXCLUDE_LIST="/dev/fd|/stats|/proc|filesystem"
P_HDR1="Summary of "
P_HDR2="======="
VERSION="1.0"

LIST()
{
head -10
}

USAGE()
{
echo "Usage: $me [ -l ] [ -i ] [ -v ]"
echo "Where -l   long listing"
echo "      -i   Filesystem inode details"
echo "      -v   Program version details"
exit 1
}
 
DF_CMD()
{
df -k | egrep -v -i "$EXCLUDE_LIST" | sort -n -r +4.0 -5.0| LIST | awk '{printf "%-32s %+4s %+8s %+8s %+8s\n", $6, $5, $2, $3, $4 }'
}


WHICH_OS()
{
uname -a | awk '{print $3}' | while read OS
do
  if [ $OS = 5.6 ] ; then
    INODE_DF="/usr/bin/df -oi"
  else
    INODE_DF="/usr/ucb/df -i"
  fi
done
}

while getopts flvi val 2>/dev/null
do
  case $val in
        f)      ;;
        l)      LIST()
                {
                tr " " " "
                }
                P_HDR1=""
                P_HDR2="";;
        v)      echo "This is version $VERSION of $me"
                exit 1 ;;
        i)      WHICH_OS 
                HDR1="Unix Filesystems by Inode Usage"
                HDR2="==============================="
                HDR3="\nFilesystem                      %IUsed   Iused    Ifree"
                DF_CMD()
                {
                   $INODE_DF 2>/dev/null | egrep -v -i "$EXCLUDE_LIST" |                    sort -n -r +3.0 -4.0 | LIST |                    awk '{printf "%-32s %+4s %+8s %+8s\n", $5, $4, $2, $3 }'
                }
                ;;
        v)      echo "Version 1.0";;
        *)      USAGE ;;
        esac
done
shift `expr $OPTIND - 1`

echo "\t$P_HDR1$HDR1\n\t$P_HDR2$HDR2$HDR3"
DF_CMD|LIST
echo