I have a directory which contains filenames including IDs in front, e.g:
32.04 Wybrane wzory matematyczne
32.01 Funkcje
31.01 Opracowania lektur EM 2023
The desired filenames after the change would respectively be:
32.04
32.01
31.01
I have other number formats in the directory, such as 30-39, or 31 {filename} so I want to specifically target the files with this floating notation.
The script should run from parent through all its subdirectories.
autoload zmv
zmv -i '(**/)(<->.<->) *' '$1$2'
-i - interactive mode; can be removed if you are comfortable with the result.-n (no-op / dry run) option is also available for testing patterns without actually renaming any files.(**/)(<->.<->) * - 'from' pattern.
(**/) - recursive glob. Note that in zsh 5.9, the parens are required, even if the component is not referenced in the 'to' pattern.<->.<-> - since <-> is a glob pattern for any number, this will find number.number. * - the rest of the filename.$1$2 - 'to' pattern. $n is the nth parenthesized expression in the 'from' pattern.
$1 - from (**/), i.e. the directory part of the full filename, with the trailing /. This will be an empty string for files in the current directory.$2 - from (<->.<->), the floating-point-like number at the start of the filename.More about zmv.
More zmv examples.
A longer zmv explanation. The description there covers many of the operators used in a previous version of this answer (zmv '(*/)#<->.<-> *' '${f:h}/${${f:t}%% *}').