Unix
The command that can be used to restrict incoming messages to a user is

mesg
sleep
grep
None of these
halt

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Unix
The % key allows you

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

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