tlmgr-backup:tldr:c70f2
The command "tlmgr backup clean --all" is a command used in TeX Live, a popular distribution of the TeX typesetting system. Here is the breakdown of the command:
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"tlmgr" refers to the TeX Live Manager, which is a command-line tool used to manage packages and updates in TeX Live.
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"backup" is a subcommand that deals with creating and managing backups of TeX Live.
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"clean" is a parameter that further specifies the backup subcommand, indicating that it should clean up backups.
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"--all" is an option that indicates that the command should apply to all packages.
So, when you execute this command, it will instruct the TeX Live Manager to clean up all backups of TeX Live packages. This can be useful to remove any unnecessary backup files and free up disk space.