AWK standard options

In this section, we discuss the three standard options that are available with all versions of AWK and other GAWK-supported options or GNU extensions. Each option in AWK begins with a dash and consists of a single character. GNU-style long options are also supported, which consist of two dashes (- -) followed by a keyword, which is the full form of an abbreviated option to uniquely identify it. If the option takes an argument, it is either immediately followed by the = sign and an argument value or a keyword, and the argument's value separated by whitespace. If an option with a value is given more than once, its last value is used.