Z:gnu-bash--f90992-Execute conditional command./en

Execute conditional command. Returns a status of 0 or 1 depending on the evaluation of the conditional expression EXPRESSION. Expressions are composed of the same primaries used by the `test' builtin, and may be combined using the following operators: ( EXPRESSION )	Returns the value of EXPRESSION ! EXPRESSION		True if EXPRESSION is false; else false EXPR1 && EXPR2	True if both EXPR1 and EXPR2 are true; else false EXPR1 || EXPR2	True if either EXPR1 or EXPR2 is true; else false When the `==' and `!=' operators are used, the string to the right of   the operator is used as a pattern and pattern matching is performed. When the `=~' operator is used, the string to the right of the operator is matched as a regular expression. The && and || operators do not evaluate EXPR2 if EXPR1 is sufficient to   determine the expression's value. Exit Status: 0 or 1 depending on value of EXPRESSION.