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→Unix / Linux Directories
In Unix / Linux (as opposed to MS Windows), there are no drive letters (such as '''C:''', or '''D:'''). All files and directories appear under a single ancestor directory called the "'''root directory'''".
Learning how to issue Linux commands for '''navigating''' and '''manipulating''' directory and files within the the Linux filesystem are '''essential skills''' for Linux users and Linux system administrators (i.e. ''sysadmins'').
In the Linux (Unix) OS, the "'''root directory'''" / is the starting directory, and other "''child directories''", "'''grandchild directories'''", etc. can be created as required. The hierarchical structure resembles an "''upside-down tree''". There is actually a command called '''tree''' that displays a "'''directory tree diagram'''"!
