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On my Linux command line, when I type a letter, or a group of letters (such as 'fr','nan', or 'ca'), pressing the tab key twice lists the following (using the above examples):

fr:

free freetype-config from

nan:

nano nant

ca:

cabal calendar callgrind_control case catchsegv
cake caller capsh caspol catman
cal callgrind_annotate captoinfo cat cautious-launcher

  1. Am I correct to assume that this is a shortcut to view all available commands beginning with the typed words (fr*, nan*, or ca*) (where, in this example, '*' is used as a wildcard)?
  2. Does this work on all command lines, or is this Linux specific?
  3. What is this feature called, and are there other similar command line shortcuts?
  4. Where can I find documentation on this shortcut?
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Am I correct to assume that this is a shortcut to view all available commands beginning with the typed words (fr*, nan*, or ca*) (where, in this example, '*' is used as a wildcard)?

yes.

Does this work on all command lines, or is this Linux specific?

I'd say most of them.

What is this feature called, and are there other similar command line shortcuts?

not sure if it has an official name, but probably command auto-completion will work. and yes there are tons of command-line shortcuts (though they maybe different for different command-lines).

Where can I find documentation on this shortcut?

for Ubuntu, see https://help.ubuntu.com/community/UsingTheTerminal!

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