2015-06-18 07:08:41 -0600, Eric Blake: [...] > $ 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. [...]
No, "special builtins" failures only cause bash to exit when in POSIX mode (like when called as "sh" or with POSIXLY_CORRECT in the environment or with --posix...). That's a feature. $ (exec -a sh bash -c 'a=1; readonly a; export a=2; echo $?') sh: a: readonly variable -- Stephane
