$ anchors the match to the end of the filename.Here's what the regular expression \.\d+\.gif$ does: gif files in the current directory that would be pointlessly matched by *. Still, you might choose to do so, if you have many non. gif suffix in the regular expression so you don't have to filter for it in the filenames you pass to rename. Remember that -n just shows you what will be done, and you must then remove it to actually rename files. gif files in the current directory are named according to your description and need to be renamed, you can use: rename -n 's/\.\d+\.gif$/\.gif/' * If you want to use a simpler rename command, and you know all the. This is to say that the solution resembles the problem. I've chosen this approach-among many possible approaches-because the command expresses precisely the naming scheme that you wish to operate on. It's possible to write a shorter rename command that ought to work. This helps avoid renaming files you don't want to rename. If the file does not begin with the necessary pattern, then there is no match. The backslash is necessary because when a dot appears in a regular expression it otherwise matches any single character. The effect is to ensure those characters are present just before the part we will actually replace. These are the characters we want to keep, after all, not the ones we want to replace. \K forgets the preceding matched characters.
I suggest this, though I'll show an alternative below: rename -n 's/^\d matches a sequence of exactly eight digits. The rename command (you can also run it as file-rename) is well-suited to this task.
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