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There are a number of operators; here there is a list, in order of
decreasing precedence.
-
( expr )
-
-
-
forces the precedence order. The parentheses must of course be quoted, as
they are meaningful for the shell too.
- ! expr
-
- -not expr
-
-
-
change the truth value
of expression, that is if expr is true, it becomes false. The
exclamation mark needn't be escaped, because it is followed by a white
space.
- expr1 expr2
-
- expr1 -a expr2
-
- expr1 -and expr2
-
-
- all correspond to the
logical AND operation, which in the first and most common case is implied.
expr2 is not evaluated, if expr1 is false.
- expr1 -o expr2
-
- expr1 -or expr2
-
-
- correspond to the
logical OR operation. expr2 is not evaluated, if expr1 is
true.
- expr1 , expr2
-
-
- is the list statement; both
expr1 and expr2 are evaluated (together with all side
effects, of course!), and the final value of the expression is that of
expr2.
Converted on:
Mon Apr 1 08:59:56 EST 1996