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tlmgr-shell:tldr:8b9ef
The command "tlmgr shell" refers to running the TeX Live Manager in a shell or command-line interface. TeX Live Manager (tlmgr) is a tool used for managing and maintaining the TeX Live distribution, which is a comprehensive set of TeX and LaTeX packages and tools.
When you execute the "tlmgr shell" command, it opens up a shell interface specific to managing TeX Live. This interface allows you to input various commands to perform tasks such as updating packages, installing new packages, removing packages, or checking for available updates.
By running "tlmgr shell," you can access the functionality of the TeX Live Manager directly from the command line, which can be convenient for advanced users who prefer working with the command line interface or need to automate certain tasks.