Re^3: Newline vs Return

That works!

In case you were curious about why it works: ~~filehandles are~~ STDOUT is line-buffered by default. This means that when you print, the output is buffered until (1) the buffer fills up or (2) you print a newline. Disabling buffering makes it output right away.

Update: correction as per ikegami's reply

Comment on Re^3: Newline vs Return

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Re^4: Newline vs Return by ikegami (Patriarch) on Oct 07, 2005 at 21:14 UTC
That's not quite true. Only STDOUT is line-buffered by default. In fact, only STDOUT is ever line-buffered(). I verified this with the following snippet: `perl -e "open(FH, q{>test}); print FH (qq{a\n}); sleep(5); print FH (q +q{a\n});"` [download] The lines only appeared after the 5 seconds were over. () Maybe XS or PerlIO can change this? Of course, `tie` could.	[reply] [d/l] [select]
Re^5: Newline vs Return by sgifford (Prior) on Oct 07, 2005 at 21:27 UTC
Actually, any filehandle connected to a TTY is line buffered; this is stdio's default. If you connect STDOUT to something other than a TTY, it will be block buffered like any other filehandle. For example (on Unix, not sure what a TTY on Windows is): `perl -e "open(FH, q{>/dev/tty}); print FH (qq{a\n}); sleep(5); print F +H (qq{a\n});"` [download] In older versions of Perl you could get line buffering with IO::Handle's `setvbuf` method, but it looks like that's no longer supported. See the stdio function `isatty` and perl's `-t` test for more information about how a TTY is detected.	[reply] [d/l] [select]