Tuesday, May 21, 2013

Top 10 ls command examples with tutorials in Linux/Unix

Top 10 LS command examples in Unix /Linux

Ls Command Examples unix/linux

Ls is one of the frequently used commands in Linux as well as UNIX and it is important to know about this command  Ls command list the names of files or directories in a directory.
ls command sort the files alphabetically and output to the standard console. when ls command is executed, Linux server does inode sorting and outputs the files on alphabetically
in Linux files metadata are stored in a data structure which includes file owner, file access rights and file type. Each inode is a unique index number in organized file system data structure
ls is one of the basic commands of Unix/Linux operating system.
ls command works on bash shell as well as CentOS of Unix.


ls command syntax usage
$ls (options) (file name or directory)

ls command syntax is shown above and ls command examples are shown below


How to display content of directory using ls command
bash-3.2$ ls
cloud.txt  directory1

ls command without options displays the files and directories in a current directory


bash-3.2$ ls
cloud.txt  directory1

How to list the inode information using ls command line

$ls -l filename
12345 filename
here 12345 is index number
l without options list the files and in the directory

How to list the files and directories in a given path
$ls -l
ls command with option -l list out the long file format information about files and directories


How to list the files based on sorting order modification time.
$ls -t
ls command with option -t displays the recently modified file first and so on

How to list directories using commands
$ls -d 
ls command with option -d outputs a list of directories in a given path, but not subdirectories

How to print the files without doing the sorting?

$ls -f  or ls -U
ls command do the sort the files alphabetical and outputs it, Suppose In a given directory, if there 500 files, To view all these files, if ls command is supplied without any arguments, server does sorting of this file's inode and takes more time in hours, so in this case we need to use ls command with option -f to list the filenames without doing sorting

How to display content of files/directory recursively

to list the files in directories and subdirectory or recursive directories
$ ls -R  
T
How to show hidden files in command line
$ ls -a  or ls -A
ls command with option -a outputs the normal files as well as hidden files. to differentiate normal file with hidden files, hidden files always start with '.'


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