Shell Programming and Scripting

#!/bin/ksh
# Saving as move_file.sh

FROMDIR=/root/test/data
TODIR=/root/test/data1
PREV_FILENAME=$(sed '1!d' prev_file.txt) # get the 1st line of the prev_file.txt
CUR_FILENAME=$(ls -tr /root/test/data/tmp_2.0*.xml | tail -1) # get the latest tmp_2.0* file

if [ "${PREV_FILENAME}" != "${CUR_FILENAME}" ] # move if previous and latest file are not the same. If not same the user has changed the file
then
	mv ${FROMDIR}/${CUR_FILENAME} ${TODIR}/tmp.xml 2>error_file.txt
	echo "Moved ${FILENAME} to tmp.xml"
	echo "${CUR_FILENAME}" > prev_file.txt # store current file name in a file to check if the same file exits in the next consecutive run
else
        echo "File not changed by the user"
fi