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mkdir pathname : make a new directory for a given pathname
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rmdir pathname : remove the directory, if it is empty.
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cd [pathname] : change the current working directory to pathname, or to / if no pathname.
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ls [pathname] : list the directory contents of pathname or the current working directory
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pwd : print the (absolute) pathname of the current working directory.
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touch pathname : make a new file for a given pathname.
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rm pathname : remove the file.
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save filename : save the current file system tree as a file.
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reload filename : construct a file system tree from a file.
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menu : show a menu of valid commands.
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quit : terminate the program.
Note: You can use sysTree to construct a file system tree.