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Internal Commands and Builtins in Shell Environment

                          A builtin is a command contained within the Bash tool set, literally built in. This is either for performance reasons -- builtins execute faster than external commands, which usually require forking off a separate process -- or because a particular builtin needs direct access to the shell internals.

Using expr

Example of expr function usage

Command Substitution in Shell scripting

Command substitution reassigns the output of a command [1] or even multiple commands; it literally plugs the command output into another context.

Special Variable Types in Shell

Some of the Special variable types in Shell programming

Variable Assignment in Shell Scripting

How assignment Operator works in Shell scripting?