-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Pádraig Brady wrote: > Bob van Loosen wrote: >> Hi everyone, >> >> Whenever I do this: >> >> tail -f /var/log/kern.log | cut -f 8- -d " " | dd bs=1 >> >> I get no output, but when I do this: >> >> tail -f /var/log/kern.log | cut -f 8- -d " " >> >> I do get output, I'm using coreutils 5.97 on Ubuntu 7.10 64 bit. > > I've documented that exact case here: > http://www.pixelbeat.org/programming/stdio_buffering/ > > There's a patch for `cut` there, > which demonstrates how to add this functionality to coreutils. > > Personally I think it would be great to add the buffering control > to glibc, so that most applications would benefit. > But Ulrich Drepper <sarcasm>in his usual amiable style</sarcasm> > suggested this was a silly idea.
It is a very silly idea, considering it would violate the C standard (§7.19.3#7): As initially opened, the standard error stream is not fully buffered; the standard input and standard output streams are fully buffered if and only if the stream can be determined not to refer to an interactive device. - -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHrJCs7M8hyUobTrERAj+kAJ9p719TmoPlOgJFHkG9hfio/4GUuwCePVxk C3ej5YbZadYuyoweKlLZ//M= =79+4 -----END PGP SIGNATURE----- _______________________________________________ Bug-coreutils mailing list Bug-coreutils@gnu.org http://lists.gnu.org/mailman/listinfo/bug-coreutils
