Perl 5 version 8.9 documentation
- printf FORMAT, LIST
print FILEHANDLE sprintf(FORMAT, LIST), except that
$\(the output record separator) is not appended. The first argument of the list will be interpreted as the
sprintffor an explanation of the format argument. If
use localeis in effect, and POSIX::setlocale() has been called, the character used for the decimal separator in formatted floating point numbers is affected by the LC_NUMERIC locale. See perllocale and POSIX.