What are the special characters in shell

This article will explain in detail what are the special characters in the shell, Xiaobian thinks it is quite practical, so share it with you as a reference, I hope you can gain something after reading this article.

#

Notes. The line begins with #(#! An exception) begins with a comment.

;

Command delimiter [semicolon, ie;]. You can write two or more commands on the same line.

;;

Terminate case option [double semicolon, ie;;].

.

Point command [period, i.e..]. Equivalent to source command

"

Partially quoted [double quotes, i.e."]. "STRING" will block (interpret) most special characters in STRING

'

Full quote [single quote, i.e.']. 'STRING' will prevent interpretation of all special characters in STRING. It's a stronger way of saying

strong form

,

Comma operator. The comma operator links a series of arithmetic operations. Although everything in it is run, only the last item is returned.

`

Command replacement. The command construct assigns the output of a command to a variable.

：

Empty command [colon, ie:]. Equivalent to NOP (no op, a command to do nothing). It can also be thought of as having the same effect as the shell's built-in true command. The ":" command is a bash built-in command with exit status "true"(0).

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