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

mesg
None of these
halt
grep
sleep

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Unix
The % key allows you

to move the cursor backward to the beginning of a word
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.
to move the cursor to the first column in the current line

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