^ Means the beginning of the line ( before the first character of the line )
$ means the end of the line (after the last character of the line )
^$ together, means a blank line! !
File name format: /etc/man_db.conf
File name: man_db.conf
The meaning of characters in Linux
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Origin blog.csdn.net/weixin_37991107/article/details/82888709
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