linux-wildcard characters

1. Wildcard characters

？ : Matches an arbitrary character

*: matches 0 or any number of characters, that is, can match any content

[]: Matches any one of the characters in brackets

[-]: matches any one of the characters in brackets,-represents a range

[^]: Indicates that a match is not a character within the brackets

Other special symbols in 2.bash

': Single quotation mark. All special characters in single quotes, such as "$" and "'" have no special meaning

"": double quotation marks. Special symbols have no special meaning in double quotes, but "$", "" "and" \ "are exceptions, with special meanings for" Call variable Value "," Reference command ", and" escape character "

": Anti-quotes. The contents of the inverted quotation mark are system commands, which are executed in bash. and $ (), it is recommended to use $ ().

$ (): used to refer to system commands

#: In the shell script, #开头代表注释

$: The value used to invoke the variable

\: Escape character. The special symbol that follows \ will lose its special meaning and become a normal character.

linux-wildcard characters