请帮忙解释下perl内置变量$|

wjlabcwjl

搜索引擎好像没法搜到$|这种符号，只知道说是　$| 控制对当前选择的输出文件句柄的缓冲，不知道什么意思，怎么用。
请各位指教下，谢谢

liyangole

$| 如果非0，则对当前选定的文件执行写或者打印操作后强制清除缓冲区

zhlong8

搜索引擎好像没法搜到$|这种符号，只知道说是　$| 控制对当前选择的输出文件句柄的缓冲，不知道什么意思，怎 ...
wjlabcwjl 发表于 2011-03-13 22:46

    这些方面 Perl 自己的文档方便多了，没必要 google
http://perldoc.perl.org/perlvar.html

wjlabcwjl

ok，谢谢了

ioerr

wao

jason680

如果没网可连,可先查...
$ perldoc perlvar
       ...
       HANDLE->autoflush(EXPR)
       $OUTPUT_AUTOFLUSH
       $|      If set to nonzero, forces a flush right away and after every
               write or print on the currently selected output channel.
               Default is 0 (regardless of whether the channel is really
               buffered by the system or not; $| tells you only whether you've
               asked Perl explicitly to flush after each write).  STDOUT will
               typically be line buffered if output is to the terminal and
               block buffered otherwise.  Setting this variable is useful
               primarily when you are outputting to a pipe or socket, such as
               when you are running a Perl program under rsh and want to see
               the output as it's happening.  This has no effect on input
               buffering.  See "getc" in perlfunc for that.  See "select" in
               perldoc on how to select the output channel.  See also
               IO::Handle. (Mnemonic: when you want your pipes to be piping
               hot.)