BASIC LINUX COMMANDS

DATE 

$ date

Displays the current

Date.

MAN 

$ man

Displays the manual

Page of our terminal.

Ls

$ ls

List the number of files and directories.

 Ls-al

$ ls-al

List all the files in thecurrent working directory

showing permissions,

ownership, size, time and

date.

Cal 

$ Cal

Displays the current

Month calendar. 
Cal 2008

$ Cal 2008

Displays the calendar of the year 2008.

Cal 5 2008

$ Cal 5 2008

Displays the calendar for fifth month of 2008.

   
Who

$ Who

Displays the number of users logged on particular system.

 

Who am I

$ Who am I

Current login user name will be displayed.

 More

$ More

It allows file contents or piped output to be sent to the screen page by page.

 file

$ file

Displays the type of file.

 rm

$ rm

Remove the file or directory.

 

mk dir

$ mkdir hai

Create a directory.

Cat filename

$ cat prog 1

To open a file.

 Echo

$ Echo SMEC

Display the string.

clear

$ clear

Clear the screen.

    

cd

Change directory.

$ cd/Home

Change the current directory to /Home.

$ cd httpd

Change the current working directory to httpd.

$ cd..

Move to parent directory of the current directory.

$ cd~

Move to user’s home directory which is “/home/username”.

 

cp

Copy files.

$ cp myfile yourfile

Copy the files “myfile” to the file “yourfile” in the current working directory.

 

$ cp-i/data/myfile

Copy the file “/data/myfile” to the current working directory.

 

$ cp – dpr

   srcdir dest dir

Copy all files from the directory “srcdir” to “destdir”.

 

cmp

$ cmpf1f2

Compare two files.

 Mv

Move or rename file.

$mv-i myfile

  yourfile

Move the file from “myfile” to “yourfile”.

$ mv-i/data/myfile

Move the file from myfile from the directory “/data” to the current working directory.

Pwd

$ pwd

Show the name of the current working directory.

sort

$ sort filename

Sort the files content in ascending order

$ sort-r filename

Sort the file content in descending order

 

Grep

$ grep-pattern filename

Searches the regular expressions in string or files.

    

Head

$ head-op filename

Access the lines from the top.

  Tail

$ tail-op filename

Access the lines to bottom.

    

uniq

$ uniq filename

I fetches one copy of redundant record.

 

Shutdown

Shuts the system down.

$ shutdown-h now

Shuts the system down to halt immediately.

$ shut down-r now

Shuts the system down immediately and the system reboots.