I

i-Node, iNode
A low-level number identifier for a file that uniquely identifies the file on its volume. Often the root directory is number 2, and the others are numbered up from there, in the order they were created.

For a given i-node number, there can be only one file on that volume. By contrast, files with the same name can exist in different directories.

See also Hard Link, File Name

info
Info is the GNU standard help facility. This is popular on Linux systems. To look up a topic such as ls, enter:
$ info ls

Info is built on top of Emacs; to exit it you can type ^X^C. See also man, and the website for the Free Software Foundation (GNU).

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