Configuration Information [Automatically generated, do not change]: Machine: x86_64 OS: linux-gnu Compiler: gcc Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H -I. -I../. -I.././include -I.././lib -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wall uname output: Linux xvii 3.11-2-amd64 #1 SMP Debian 3.11.10-1 (2013-12-04) x86_64 GNU/Linux Machine Type: x86_64-pc-linux-gnu
Bash Version: 4.3 Patch Level: 24 Release Status: release Description: When a pipeline starting with "!" is run in background, bash sets $? to 1 instead of 0. POSIX says: The exit status of an asynchronous list shall be zero. in http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_03_02 Note that other shells (dash, ksh93, mksh, zsh) behave correctly. I've also reported the bug in the Debian BTS: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=758969 Repeat-By: vinc17@xvii:~$ ! true & [1] 15171 vinc17@xvii:~$ echo $? 1 [1]+ Done true
