ls — List directory contents
Summary :
List the current directory contents and informations. This is one important command you would be using all the time. It is synonymous with the dir command in DOS.
Examples :
$ ls — Alphabetically list all files and dir
$ ls -r — Reverse order
$ ls –color=always — Output in color
$ ls -F — Files are classified with /@|= symbols
$ ls -1 — Output in single column
$ ls -a — Display hidden entries starting with .
$ ls -R — Recursive output
$ ls -Q — Enclose entry names in double quotes
Read : man ls