8.2. Command Line Shortcuts
8.2.1. Command and Filename Completion
To save typing, bash implements command and filename completion, a mechanism that allows you to type part of a command or filename, press the Tab key, and the rest of the word will be completed for you.
If you type the first letters in a command, and press the Tab key, bash will attempt to complete the command and execute it. If bash cannot complete the filename or command, because neither exists, the terminal may beep and the cursor will stay at the end of the command. If there is more than one command starting with those characters and you press the Tab key a second time, all commands that start with those characters will be listed.
If there are several files starting with ...
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