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What is Linux Shell?

WHAT IS LINUX SHELL --- HOME --- SHELL PROMPT

Provides user program/environment for user interaction.
Command language interpretor which read from standard input.
Gets started when we login or start the terminal.
Shell is not a part of Kernel, but uses Kernel to execute programs.

Different Shells:

BASH (Bourne Again Shell) : It is the most common shell. It is OpenSource.
CSH (C Shell) : It's syntax and usage is similar to C.
KSH (K Shell) : It is the base for POSIX shell apps.
TCHS : It's the enhanced and compatible version of CSH.