List of Some Useful Linux Commands

• Some General commands:

1. Check your current working directory/location :

   $ pwd

   

2. To display the name of current logged in user :

   $ whoami

   

3. To check System date and time :

    $ date

we can customize the result of the date command ,Some examples are following :

 $ date +%D   # used only for getting the date

 $ date +%T   # used only for getting the current time

 $ date +%H:%M   # used only for getting the current time in HH:MM format

 $ date +%h   # used only for getting the first 3 letters of month name

4. To display/list files and directories present in current location :

   $ ls

   

   Options for ls command :

   $ ls -lt   #This displays latest modified file on the top and it is long listing format.
   
   $ ls -ltr  #This is opposite for command for lt option and output result will be in reverse order.
   
   $ ls -lh  #This displays the output in human readble and long listing format.

output format for **ls **command will be in following manner :

<File-permission> <No. of hard links> <owner-name> <Group> <Modification-date-and-time> <File-size> <File-Name>

6. space for short listing format :

7. To clear current Terminal screen:

   $ clear

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• Commands related to Files and Directories:

1. To display content of the file on terminal

    $ cat <file-name>

Note: If the file does not have an extension, do not mention it. If the file has an extension, mention the file name along with the extension.

2. To create a new file:

      $ touch <new_file_name>

   

Note: File name can have an extension or may not have an extension.