zmv:tldr:ce003

The command zmv -v '${(*)-log}' '${$1-txt}' is a command used in the zsh shell to rename files in bulk using pattern matching and substitution.

Here's a breakdown of the command:

• zmv - This is the command used to perform file renaming in zsh shell.

• -v - This option stands for "verbose" and it displays the details of each file renaming operation in the output.

• '${(*)-log}' - This is the pattern to match the files that need to be renamed.

  • ${(*)-log} uses a glob qualifier, (*), to match any file name. If no file matches this pattern, it defaults to the string 'log'. So, it will rename any file that matches the pattern to 'log'.

• '${$1-txt}' - This is the replacement pattern for the renamed files.

  • ${$1-txt} uses a replacement modifier, $1, to retrieve the part of the file name matched by the pattern, then replaces it with 'txt'. So, it renames the matched file to have the same name but with the extension changed to 'txt'.

Overall, this command will find all files in the current directory (or specified directory) and recursively rename them from their existing extension (or no extension) to 'txt'. It displays the details of each renaming operation.