Oldest file in the Directory
If you need to find the oldest file in the directory you can use a shortcut as </p>
Localhost> ls -t |tail -1
20100228-235312-9267-1.pdf
-t switch Sort by the timestamp shown and tail gives you the last line. so you are able to see the oldest file.
To see newest file use
Localhost> ls -t |head -1
20100228-235312-9267-1.pdf
if you are willing to see long listing change the head -2 ( since long listing creates a summery line at the top of output )</div>