One of the most useful features of many shells is tab completion. When a partial command or filename is entered on the command line, and the user presses the Tab key, the command or filename will be completed for you. Ex, typing cat hello, followed by tab, will result in cat Hello\ World.txt if such a file exist in the directory.
If you double click tab while typing you get the full command, or if there is more options you get sugestions on them.
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