What does '.' (dot) stand for in linux

“.”(dot)

In the shell, users should all know that one dot represents the current directory and two dots represent the upper directory.

CDPATH=.:~:/home:/home/web:/var:/usr/local

In the upstream CDPATH setting, the dot after the equal sign represents the current directory.

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If the file name starts with dot, the file is a special file, and the -a option must be added to the ls command. will be displayed.

In addition, in regularexpression, a dot represents matching one character.

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