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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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