rename在man中的解释为：
NAME
rename - rename files
SYNOPSIS
rename [options] expression replacement file...
DESCRIPTION
rename will rename the specified files by replacing the first occurrence of expression in their name by replacement.
OPTIONS
-v, --verbose
Give visual feedback which files where renamed, if any.
-V, --version
Display version information and exit.
-s, --symlink
Peform rename on symlink target
-h, --help
Display help text and exit.
EXAMPLES
Given the files foo1, ..., foo9, foo10, ..., foo278, the commands
rename foo foo0 foo?
rename foo foo0 foo??
will turn them into foo001, ..., foo009, foo010, ..., foo278. And
rename .htm .html *.htm
will fix the extension of your html files.
WARNING
The renaming has no safeguards. If the user has permission to rewrite file names, the command will perform the action without any questions. For example,
the result can be quite drastic when the command is run as root in the /lib directory. Always make a backup before running the command, unless you truly
know what you are doing.
SEE ALSO
mmv(1), mv(1)
其参数为三个，而不是两个
mv指令也可以更改文件名，但是只能一个一个更改
rename命令提供了批量更改的渠道
用法如下：
比如一个文件夹下有如下文件
20190328. 20190329. 20190330. 20190331. 20190401. 20190402. 20190403. 20190404. 20190405. 20190406. 20190407. 20190408. 20190409.
我要把每个文件后面的“.”置换成“.txt”则只需执行如下命令
rename . .txt *.
这样就 okl
“*”是通配符，还有“？”是代表一个字符
希望对大家有所帮助
以上