Basic UNIX/LINUX commands:ls command

Some of the most frequently used commands in Linux are:

1.ls: This command is used for directory listing.It is same as dir command in MSDOS.
Switches used with this command are:

COMMAND	SWITCH	RESULT
ls	-a	displays all file name including those beginning with a dot
ls	-d .*	Only filenames beginning with a dot
ls	/	lists the contents of the root directory
ls	-l	prints long listing with description of permissions,links,ownership,size etc
ls	/dir	filenames inside dir
ls	-d /dir	only shows the description of dir not its content
ls	-R	recursive file list
ls	-t	Filenames sorted by last modification time
ls	-u	Filenames sorted by last access time
ls	-i	inode number
ls	-ltr	sorts listing chronologically form older to newer