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Equivalent to 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
printf(@_) will use $_[0]
 as the format.  See
sprintf for an explanation of the format
argument.  If use locale
 (including 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_NUMERIC
 locale 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 $_ .
Don't fall into the trap of using a printf when a simple print would do. The print is more efficient and less error prone.