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tlmgr-update:tldr:ad603
The command "sudo tlmgr update --self" is used to update the TeX Live Manager (tlmgr) tool itself.
Here is a breakdown of the command:
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"sudo": This is a command used in Unix-like operating systems that allows a user with administrative privileges (usually the root user) to execute a command as a superuser.
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"tlmgr": This is the command-line tool for managing the TeX Live distribution. It allows users to install, update, and remove packages.
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"update": This is an option for tlmgr that specifies the action to be performed, which in this case is to update something.
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"--self": This is another option for tlmgr that specifies what should be updated. The "--self" option tells tlmgr to update itself, i.e., to download and install any available updates for the tlmgr tool.
Overall, the command "sudo tlmgr update --self" is used to update the TeX Live Manager tool to the latest version available.