Basic Commands in linux

 Linux commands:

Listing files(ls): to see the list of files on UNIX or Linux system.

Ls- R: shows all the files not only in directories but also sub directories.

Ls -al - gives detailed information of the files.

ls - a - command to view hidden files.

Creating and viewing files:

cat - commands is used to display text files. It is also used for copying, combining and creating new text files.

cat filename - to view the file created.

Deleting files

Cat command - It will only show a message when something goes wrong or when an error has occurred.

 cat sample - to view the new combo file "sample".

rm - removes files from the system without confirmation.

mv - to move a file to different directory. The command needs super user/ root user permission. Currently the command is executed as a standard user.

sudo - used to overcome error.

sudo program allows regular users to run programs with the security privileges of the super user or root user.

Moving and renaming files:

sudo command ask for password authentication.

Re-naming files:

mv can also be used for renaming file. 

Syntax: mv filename newfilename.

Directory ManipulationsL

mkdir - command for creating directories on a Linux operating system. 

To create a directory in a different location other than 'Home directory' i.e., create a directory 'Music' under '/tmp' directory, use mkdir /tmp/MUSIC.

Removing directories

rmdir - used to remove directory.

Renaming directories

mv command can also be used for renaming directories.

Search command

grep (global regular expression print): It is used to search text in files and print that matches the given pattern.

find: It is used to search files and directories.

Other important Commands

History - it shows all the commands used in the past for the current terminal session. Helps user refer to the old commands entered and re-use them in again.

clear - clears all the clutters on the terminal and gives you a clean window to work on.

Text Editor:

vi (Visual Editor): It is terminal based text editor that you can use to write any files.

vi or vim can be used to work.

Summary