Implementation of unix ls command.
List files and directories in specified order.
myls [path|mask] [-l] [-h|--help] [--sort=U|S|t|X|D|s] [-r]
-l -- print detailed information about each file / directory.
-h|--help -- help screen.
--sort -- sorting option.
U-- unsorted.S-- by size.t-- by time of last modification.N-- by name (default option).D-- directories first.s-- specific files separately.
-r -- reversed order of sorted option.
-F -- specify type of special files.
-R -- bypass directories recursively.