bash: Numeric Arguments
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1 8.4.5 Specifying Numeric Arguments
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1 'digit-argument (M-0, M-1, ... M--)'
1 Add this digit to the argument already accumulating, or start a new
1 argument. 'M--' starts a negative argument.
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1 'universal-argument ()'
1 This is another way to specify an argument. If this command is
1 followed by one or more digits, optionally with a leading minus
1 sign, those digits define the argument. If the command is followed
1 by digits, executing 'universal-argument' again ends the numeric
1 argument, but is otherwise ignored. As a special case, if this
1 command is immediately followed by a character that is neither a
1 digit nor minus sign, the argument count for the next command is
1 multiplied by four. The argument count is initially one, so
1 executing this function the first time makes the argument count
1 four, a second time makes the argument count sixteen, and so on.
1 By default, this is not bound to a key.
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