perl - 打印 $/而不是\n 是错误的吗？

Question

Perl 的文档说 $/是:

The input record separator, newline by default. This influences Perl's idea of what a "line" is.

那么，基本上是错误的:

print STDERR $var, $/;

代替:

print STDERR "$var\n";

?

如果我做前者会出什么问题？

Answer 1

也许您正在寻找输出记录分隔符？

perldoc perlvar:

 IO::Handle->output_record_separator( EXPR )
   $OUTPUT_RECORD_SEPARATOR
   $ORS
   $\

The output record separator for the print operator. If defined, this value is printed after the last of print's arguments. Default is "undef".

You cannot call "output_record_separator()" on a handle, only as a static method. See IO::Handle.

Mnemonic: you set "$\" instead of adding "\n" at the end of the print. Also, it's just like $/, but it's what you get "back" from Perl.

例如，

$\ = $/;
print STDERR $var;