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of course, replace the "-" after / by the character you wish. a dot must by protected by a backslash, as it is a regexp. it's the same result as the command proposed. but if there is more than a dash in the name, only the part before the first dash is kept... so that's not an "extension renaming" command.
There is 1 alternative - vote for the best!
Renames files eliminating suffix, in this case everything after "-" is cutted. Just change "-" with the character you need.
replace the "-" by the character you wish. If you have multiple extentions, like jpef, jpg and JPG you could use
mmv "*-*.*" "#1.#3"
If you can do better, submit your command here.
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