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I have many files with .MP3 and .mkv suffix but after .MP3 and .mkv they have other characters. For example, guitar.mp3?1234yhh, How can I write a script that rename my files to a correct suffix?
Yes, "rename" is what you want, unless you really want to write your own script. Just be sure to use it with the -n option while figuring out the right patterns to use. As far as the patterns go, they are normal perl expressions, so anything perl works. You may have already encountered perl patterns in the form of PCRE.
Another command which you can use for such tasks is "mmv". To strip off everything after .mp3, you'd use:
mmv -v "*.mp3*" "#1.mp3"
-v flag means "verbose". This lets you see what it's doing.
"*.mp3*" matches any file with ".mp3" in it, with two wildcards. Those wildcards will get mapped to #1 and #2.
"#1.mp3" means the contents of the first wildcard (#1) plus ".mp3". The contents of the second wildcard (#2) are ignored.
Note that this means there is a possibility of a name collision. But mmv has a built in safety check that will warn you if there is a name collision. If it detects a name collision, it will do nothing to the files.