letlet: let arg [arg ...] Each ARG is an arithmetic expression to be evaluated. Evaluation is done in fixedwidth 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 equalprecedence operators. The levels are listed in order of decreasing precedence. id++, id variable postincrement, postdecrement ++id, id variable preincrement, predecrement , + 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 fixedwidth 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. Subexpressions 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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