way 1:

$ ls -lrt | awk '{ f=$NF }; END{ print f }'

The above awk is to print the last argument of the last line

way 2:

$ ls -t1 | head -n1

http://unstableme.blogspot.com/2008/06/find-latest-file-in-directorybash.html

To find the latest file in a particular dir

Find Latest file in a directory

command, Bash

Bash