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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.
when someone mail you his ssh public key, and the lines are broken with '\n', you can reconstruct a new file with one key by line with this command.