1 1 3.4 Boolean Expressions 1 ======================= 1 1 Boolean operations are also legal. (POSIX 'bc' does NOT have boolean 1 operations). The result of all boolean operations are 0 and 1 (for 1 false and true) as in relational expressions. The boolean operators 1 are: 1 1 '!expr' 1 The result is 1 if expr is 0. 1 1 'expr && expr' 1 The result is 1 if both expressions are non-zero. 1 1 'expr || expr' 1 The result is 1 if either expression is non-zero. 1