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Perl 5 version 26.0 documentation
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  • printf FILEHANDLE
  • printf FORMAT, LIST
  • printf

    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.