Perl5 リファレンス



       printf FILEHANDLE FORMAT, LIST

       printf FORMAT, LIST
               Equivalent to `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 `printf'
               format.  If `use locale' is in effect, the
               character used for the decimal point in formatted
               real numbers is affected by the LC_NUMERIC locale.
               See the perllocale manpage.

               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.


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