"Learning Notes" shell wildcard, character set, character set extension

Wildcard characters:

The so-called wildcard, refers to the time a file name style, can be used to compare the file name to find the matching files.

*: Represents an arbitrary string, which can be an empty string

？ : Represents a character, but cannot be considered empty

Example: List all the files under/usr/bin

ls-la/usr/bin/*

Lists files under/usr/bin with a file name length of 4:

ls-la/usr/bin/????

Character Set:

The symbol for the character set is the bracket: []

[A-Z]:

[A-Z]:

[0-9]

[A-za-z]

[A-za-z0-9]

The symbol for the bracket extension is {} and its purpose is to combine strings.

For example {G,NC,S}FTP represents the string enumerated in {}, which is combined with FTP, respectively. She represents Gftp,ncftp,sftp.

"Learning Notes" shell wildcard, character set, character set extension