"Unix systems provide a number of commands to manage files and directories. Their strong point is the ability to use them in a rather simple manner against a group of files/directories meeting certain conditions. For example all the files satisfying specific criteria can be deleted or have their names changed en masse.
"1. ls
"It is very frequently used command. It redirects directory contents to standard output. If issued without any path it will list current directory (where we are at present)..."
