Shell Programming and Scripting

....
if [ $# -le 0 ]
then
        echo "Usage: $0 product_name APPLICATION_ID"
        exit 1
fi
....

 echo " exit 1 "

echo "\$# value is : " $#

if [ $# -le 0 ]
then
        echo "Usage: $0 product_name APPLICATION_ID"
        exit 1
fi

echo "\$# value is : " $#
if [ $# -ne 1 ]
then
    echo "Usage: $PROG hostname"
    #exit 0
    echo " exit 1 " 
fi        

$>.  sync_af  

$# value is :  0
Usage:  hostname
 exit 1

#!/bin/ksh
# This script checks the percentage of disk usage 
# and will send an email if disk usage is more than 80%(default).
# You can reset the threshold by assigning a value to threshold variable @ line 19 

CURDIR=`dirname $0`
. $CURDIR/commands

if [ $# -le 0 ]
then
        echo "Usage: $0 product_name APPLICATION_ID"
        exit 1
fi

SERVER=$1
PROGRAM=`basename $0`
PROG="${2}+$PROGRAM"

typeset -i threshold=80
typeset -i USAGE
tmpfile=/home/dba/oracle11g/amreview/bin/$PROGRAM.$$.tmp
touch $tmpfile

for Disk in `df -P| grep '%' | grep '^/' | awk '{print $6}'`
do
  INFO=`/bin/df -h -P $Disk| awk '{print $5,$6}'`  
  INFO=`echo $INFO | awk '{print $3,$4}'`
  USAGE=`echo $INFO | cut -d% -f1`
  if (( USAGE > threshold ))
  then
      echo "Warning :DISC usage :$INFO " >>$tmpfile
  fi
done

if [ -s $tmpfile ]
then 
    $CURDIR/writelog -p $PROG -s 4 -S $SERVER -f $tmpfile
fi

/bin/rm $tmpfile

if (( USAGE > threshold ))