BASIC LINUX COMMANDS

                
      COMMAND
EXAMPLE                          
    DESCRIPTION
       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 the
current 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.


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