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1. The command line
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.. toctree::
   :maxdepth: 1

   What is the command line? <rec01a_what_is_command_line.ipynb>
   Maneuvering around directories <rec01b_maneuvering_directories.ipynb>
   Working with files <rec01c_working_with_files.ipynb>
   Aliases <rec01d_aliases.ipynb>
   Summary <rec01e_summary.ipynb>