The Linux Newbie Guide - rename Command

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The rename command is a powerful tool for batch renaming files when you want to apply a specific rule to multiple file names. Its basic usage is as follows:
rename [options] 's/string_to_replace/replacement_string/' files...

In this command:

[options] are any additional options you want to use.
's/string_to_replace/replacement_string/' is the renaming rule that tells rename to replace the specified part of the file names with the given string.
files... are the files you want to rename.

Here are a couple of examples:

$ rename .c++ .cpp *.c++ ←to rename all files in the current directory with the extension ".c++" to ".cpp"
$ rename baidu yahoo * ←To replace occurrences of "baidu" with "yahoo" in all file names:

More rename examples and explanations can be found at the following link.