The following sections contain examples for each of the arithmetic operators available to the Korn shell. Table 6.1 lists all of the arithmetic operators available to the Korn shell in order of precedence.
Evaluates to the negative value of expression.
$ ((X=—7)) $ ((Y=—X + 2)) $ print — "$X $Y" —7 9
The print – command is used so that the negative sign is not interpreted as an argument.
The ! operator returns 0 (true) for expressions that do not evaluate to zero, or 1 (false) if they do.
$ X=0 $ ((X=!X)); print "$X" 1 $ ((X=!X)); print "$X" 0
Evaluates to the bitwise negated value (one's complement) of expression. It returns a ...