Shell script to find the latest file

The below shell script will help to find the latest file and name starting with “sales”.

Example the below files are available in UNIX box.
sales_2007_02_23_0010.dat
sales_2007_02_24_0024.dat
sales_2007_02_24_0714.dat
sales_2007_02_25_0010.dat
sales_2007_02_25_0525.dat
sales_2007_02_25_0835.dat

There are 3 files on 25th with different time stamp. The aim is identify the latest file. So the script check the latest file based on the time when that file has created in the UNIX box.

Script : latest_file.sh

#!/usr/bin/ksh
rm -f /home/hb/ms/hb/karthi/sales.dat
val=`ls -lrt sales* tail -1 awk '{print $9}'`
echo $val
ls /home/hb/ms/hb/karthi/$val
cp /home/hb/ms/hb/karthi/$val /home/hb/ms/hb/karthi/sales.dat