Shell

Command line (shell) -> part of OS user interacts with. Shell passes the user commands to the kernel (core of OS)

Shell operation diagram

Some shell types

• Bourne Shell

• Bash Shell

• Z Shell

• C Shell

• Korn Shell

• Fish Shell

• PowerShell

Shorcuts

<CTRL> + L -> clean screen
<CTRL> + R -> find previously used commands

Advantages

Memory saving -> there is no graphical interface
Time   saving -> it makes the job easier