язык сканирования и обработки шаблонов (pattern scanning and processing language)
HISTORICAL FEATURES
There is one feature of historical AWK implementations that gawk
supports: It is possible to call the length() built-in function
not only with no argument, but even without parentheses! Thus,
a = length # Holy Algol 60, Batman!
is the same as either of
a = length()
a = length($0)
Using this feature is poor practice, and gawk issues a warning
about its use if --lint is specified on the command line.
