On Mon, Jul 18, 2016 at 11:22 AM, walter harms <wha...@bfs.de> wrote:
> > Configuration Information [Automatically generated, do not change]: > Machine: x86_64 > OS: linux-gnu > Compiler: gcc -I/home/abuild/rpmbuild/BUILD/bash-4.2 > -L/home/abuild/rpmbuild/BUILD/bash-4.2/../readline-6.2 > Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' > -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-suse-linux-gnu' > -DCONF_VENDOR='suse' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' > -DSHELL -DHAVE_CONFIG_H -I. -I. -I./include -I./lib > -fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 > -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g > -D_GNU_SOURCE -DRECYCLES_PIDS -Wall -g -Wuninitialized -Wextra > -Wno-unprototyped-calls -Wno-switch-enum -Wno-unused-variable > -Wno-unused-parameter -ftree-loop-linear -pipe -DBNC382214=0 -fprofile-use > uname output: Linux omnfr121 4.5.0-4.g3d86af7-default #1 SMP PREEMPT Fri > Mar 18 13:03:45 UTC 2016 (3d86af7) x86_64 x86_64 x86_64 GNU/Linux > Machine Type: x86_64-suse-linux-gnu > > Bash Version: 4.2 > Patch Level: 47 > Release Status: release > > Description: ordering of printed lines changes when merging stdin/stdout > and redirecting > > The problem is that buffering of stdout changes depending on where it goes (line buffered in a terminal, fully buffered in a file), see for instance: http://www.pixelbeat.org/programming/stdio_buffering/ This should be documented in your libc library. You could flush stdout in your program, for other workarounds see http://mywiki.wooledge.org/BashFAQ/009
