tlmgr-restore:tldr:0f69e

The command "tlmgr restore ${package} ${revision}" is used to restore a TeX Live package to a specific revision.

Here is its breakdown:

• "tlmgr" refers to the TeX Live Manager, which is a command-line tool for managing TeX Live packages.
• "restore" is the command used to restore a package.
• "${package}" is a placeholder for the name of the package that you want to restore. You need to replace "${package}" with the actual name of the package that you want to restore.
• "${revision}" is a placeholder for the specific revision of the package that you want to restore. Just like "${package}", you need to replace "${revision}" with the actual revision number of the package.

By running this command with the appropriate package name and revision number, you can restore a TeX Live package to a specific version, undoing any updates or changes that might have been made.