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Library: GNU bash Command Reference (Darwin 9.0)

let

let: let arg [arg ...]

Each ARG is an arithmetic expression to be evaluated.  Evaluation
is done in fixed-width integers with no check for overflow, though
division by 0 is trapped and flagged as an error.  The following
list of operators is grouped into levels of equal-precedence operators.
The levels are listed in order of decreasing precedence.

id++, id--	variable post-increment, post-decrement
++id, --id	variable pre-increment, pre-decrement
-, +		unary minus, plus
!, ~		logical and bitwise negation
**		exponentiation
*, /, %		multiplication, division, remainder
+, -		addition, subtraction
<<, >>		left and right bitwise shifts
<=, >=, <, >	comparison
==, !=		equality, inequality
&		bitwise AND
^		bitwise XOR
|		bitwise OR
&&		logical AND
||		logical OR
expr ? expr : expr
conditional operator
=, *=, /=, %=,
+=, -=, <<=, >>=,
&=, ^=, |=	assignment

Shell variables are allowed as operands.  The name of the variable
is replaced by its value (coerced to a fixed-width integer) within
an expression.  The variable need not have its integer attribute
turned on to be used in an expression.

Operators are evaluated in order of precedence.  Sub-expressions in
parentheses are evaluated first and may override the precedence
rules above.

If the last ARG evaluates to 0, let returns 1; 0 is returned
otherwise.

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