UNIX for Dummies Questions & Answers

#!/bin/ksh

#set -x

if [ "$#" != "3" ]
then
    echo "Usage: $0 <1stfile_name> <2ndfile_name> <poll_interval_in_sec> "
    exit 1
fi

OLDDATE=$(date --date='3 days ago' +"%Y%m%d")
EXPECTINGDATE=$(date --date='2 days ago' +"%Y%m%d")
TARGETDATE=$(date --date='1 day ago' +"%Y%m%d")

sed -e "s/$EXPECTINGDATE/$TARGETDATE/ig" rename.sh > rename.tmp && mv rename.tmp rename.sh
sed -e "s/$OLDDATE/$EXPECTINGDATE/ig" rename.sh > rename.tmp && mv rename.tmp rename.sh
chmod +x rename.sh

#echo "inputfiledate is $EXPECTINGDATE and outputfiledate is $TARGETDATE and previous date is $OLDDATE"

FIRST_FILE_NAME=$1
SECOND_FILE_NAME=$2
POLL_INTERVAL=$3


while [ "$#" != "1" ]
do
  if  [ -f $FIRST_FILE_NAME  ]
    then 
     
      echo "executing rename.sh for the first time"
      ./rename.sh

      break
    fi
    sleep $POLL_INTERVAL
 echo "File yet to come"
done

while [ "$#" != "1" ]
do
  if  [ -f $SECOND_FILE_NAME  ]
    then
    
      echo "executing rename.sh for the second time"
     ./rename.sh
break 
fi
sleep $POLL_INTERVAL
echo "File yet to come"
done