On 06/24/2011 03:51 AM, Harald Dunkel wrote: > Hi folks, > > A colleague pointed me to this problem: If I run > > ( set -e; ( false; echo x ) ) > > in bash 4.1.5, then there is no screen output, as > expected. If I change this to > > ( set -e; ( false; echo x ) || echo y ) > > then I get "x" instead of "y". How comes?
Because '(false; echo x)' is on the left hand of ||, which disables set -e for that portion of the command line. ksh behaves the same way, so it is not a bash bug. > Any helpful comment would be highly appreciated. set -e seldom does exactly what you want - even the writers of POSIX 2008 got it wrong, and here's how they corrected it: http://austingroupbugs.net/view.php?id=52 and that's what bash 4.1 implemented. -- Eric Blake ebl...@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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