язык сканирования и обработки шаблонов (pattern scanning and processing language)
OPTION FORMAT
Gawk options may be either traditional POSIX-style one letter
options, or GNU-style long options. POSIX options start with a
single '-', while long options start with '--'. Long options are
provided for both GNU-specific features and for POSIX-mandated
features.
Gawk-specific options are typically used in long-option form.
Arguments to long options are either joined with the option by an
= sign, with no intervening spaces, or they may be provided in
the next command line argument. Long options may be abbreviated,
as long as the abbreviation remains unique.
Additionally, every long option has a corresponding short option,
so that the option's functionality may be used from within #!
executable scripts.
