What is Linux ?

What is Linux?

Linux is an open-source software operating system, which was developed by Linus Torvalds in September 1991.

Today many year pass and Linux become one of the most popular operating systems.

Today 90% of the fastest supercomputers out of 500 runs on Linux.

When we open Linux os and see a black screen that is nothing but a shell. Shell wrote in c/c++ language. shell communicates with the kernel via commands. Krenel directly communicates with the hardware.

Following is Linux Directory Structure:-

The following are commands of Linux:-

pwd:- It shows the present working directory.

ls:- It shows the available files.

uname:- It shows the username.

uname -r:- It shows a version of the kernel.

cd**:**- It is used for changing the directory.

clear:- It is used to clear the screen.

whoami**:**- It shows the current login user name.

history:- It shows a list of previously used commands.

date:- It shows the time and date.

Commands for directory and files:-

mkdir:- It is used to create the directory.
Syntax:- mkdir FolderName

touch:- Create the file.
Syntax:- touch FileName

rm -r:- Remove everything from the directory.
Syntax:- rm -r FolderName

useradd:- Add the user.
Syntax:- useradd UserName

passwd:- Changing or setting the password of the user.
Syntax:- passwd UserName

su:- Switch the user.
Syntax:- su UserName

echo:- print anything in the file.
Syntax:- echo "anything writes you want...."

mv:- Rename
Syntax:- mv old_file new_File