Perl 5 version 26.3 documentation
- printf FILEHANDLE
- printf FORMAT, LIST
print FILEHANDLE sprintf(FORMAT, LIST), except that $\ (the output record separator) is not appended. The FORMAT and the LIST are actually parsed as a single list. The first argument of the list will be interpreted as the printf format. This means that
$_as the format. See sprintf for an explanation of the format argument. If
use locale ':not_characters') is 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_NUMERIClocale setting. See perllocale and POSIX.
For historical reasons, if you omit the list, $_ is used as the format; to use FILEHANDLE without a list, you must use a bareword filehandle like
FH, not an indirect one like
$fh. However, this will rarely do what you want; if $_ contains formatting codes, they will be replaced with the empty string and a warning will be emitted if warnings are enabled. Just use print if you want to print the contents of $_ .