On 06/18/2015 06:51 AM, Chet Ramey wrote: > > Neither of these are failures; the export command returns success. In > fact, according to Posix, the export command cannot fail.
Not quite true; export CAN fail: http://austingroupbugs.net/view.php?id=351 http://austingroupbugs.net/view.php?id=654 such as when trying to modify a readonly variable: $ bash -c 'a=1; readonly a; export a=2; echo $?' bash: a: readonly variable 1 In fact, bash _didn't_ abort, while other shells do: $ dash -c 'a=1; readonly a; export a=2; echo $?' dash: 1: export: a: is read only $ ksh -c 'a=1; readonly a; export a=2; echo $?' ksh: a: is read only so that's arguably a bug in bash. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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