Shell Programming and Scripting

#!/bin/ksh

numOfRetries=3
sleepTime=3

transfFileFinished ()
{
	valFilePath="${1}"
	if [ ! -f "${valFilePath}" ]
	then
		echo "ERROR: File does not exist: [${valFilePath}]. Exit 1."
		exit 1
	fi
	
	oldFileSize=`ls -l "${valFilePath}" | awk '{print $5}'`
	while true
	do
		if [ ${numOfRetries} -eq 0 ]
		then
			echo "File transfer ok. Max number of retries reached: [${numOfRetries}]"
			return 0
		fi
	
		currFileSize=`ls -l "${valFilePath}" | awk '{print $5}'`
		if [ ${oldFileSize} -eq ${currFileSize} ]
		then
			# If reaches here ${numOfRetries} times, so the file is ok
			numOfRetries=`expr ${numOfRetries} - 1`
		else
			echo "File size differ. Old File Size: [${oldFileSize}] - Curr File Size: [${currFileSize}]."
		fi
		
		echo "Old File Size: [${oldFileSize}] - Curr File Size: [${currFileSize}] - Retry: [${numOfRetries}] - Sleeping: [${sleepTime}]..."
		sleep ${sleepTime}
		oldFileSize=`ls -l "${valFilePath}" | awk '{print $5}'`
	done
}

transfFileFinished "./TestFile.txt"