![]() ![]() The purpose of special argument -, which is supported by most utilities, is to signal that subsequent arguments should be treated as operands (values), even if they look like options due to starting with -, as Jacob C. For example, if you type rename boot.new boot.ini from the C:> prompt, the boot.new file located in C: will be renamed to boot.ini. Similar to the bash solution, s/././ performs text substitution, but - unlike in bash - true regular expressions are used. In this one, the rename command has no drive: or path information specified, so the boot.new file is renamed to boot.ini, all within the directory you typed the rename command from.Here's the equivalent of the command at the top using rename: rename -n -e 's/_.*_/_/' *.pngĪgain, this command performs a dry run remove -n to perform actual renaming. Once you test this, you can replace echo with mv to do the actual renaming. Loop through each FILE and echo out the original folder+file, followed by the folder and file with the suffix removed by patten matching. On macOS you can install it using popular package manager Homebrew as follows: brew install rename Do inverse grep on that list, leaving just the file names. If you find yourself batch-renaming files frequently, consider installing a specialized tool such as the Perl-based rename utility. Note that _*_ is a pattern (a wildcard expression, as also used for globbing), not a regular expression (to learn about patterns, run man bash and search for Pattern Matching).In your specific case you can use the following bash command ( bash is the default shell on macOS): for f in *.png do echo mv "$f" "$" is an application of bash parameter expansion: the (first) substring matching pattern _*_ is replaced with literal _, effectively cutting the middle token from the name.
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