Z:gnu-bash--6d96b9-Evaluate arithmetic expression/en

Evaluate arithmetic expressions. Evaluate each ARG as an arithmetic expression. 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. Exit Status: If the last ARG evaluates to 0, let returns 1; let returns 0 otherwise.