Unix
The % key allows you

to move the cursor backward to the beginning of a word
to move the cursor to the first column in the current line
to move the cursor to the upperleft corner of the screen
to move the cursor to a matching delimiter, when a delimiters a parenthesis, a bracket, or a brace.

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Unix
The special shell variable $* is used

to name the command being executed
to list the positional parameters
to process number of the current shell
None of these
to exit status of ast command executed.

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