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A terminal is a user interface, while a shell is running inside a terminal. Early Terminals Ear...

The definition of Subshell in some books or materials is unclear, and the explanations often cont...

A shell is a command-line interpreter that lets you interact with the operating system by typing ...

Builtin Commands Builtin commands are implemented by the Shell itself, they run without starting...

The Mysterious ^[[A First, start a new Shell /bin/sh. /bin/sh Then enter the following command,...

Default Shell echo $SHELL /bin/bash If you start a new Shell in the current terminal (e.g., sw...

Shebang #!/usr/bin/env bash Variable Assignment No spaces are allowed around the = sign. name=...

Parameters: $? The exit code of the previous command or script, 0 for success, non-0 for failure...

Bash Shell By default, the Bash Shell ignores the SIGQUIT(3) and SIGTERM(15) signals, so executi...

In Bash, parameter expansion is a mechanism for manipulating and handling the contents of variabl...