On 02/23/2016 11:44 AM, Harald van Dijk wrote: > This matches bash's behaviour, aside from bash requiring -- to prevent > detection of invalid flags to the alias command: > > bash-4.3$ alias -- -=true Then dash DOES have a bug: # dash $ alias -- -='echo hi' alias: -- not found $ echo $? 1 $ - hi $ POSIX XCU 1.4 is clear: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap01.html "Default Behavior: When this section is listed as "None.", it means that the implementation need not support any options. Standard utilities that do not accept options, but that do accept operands, shall recognize "--" as a first argument to be discarded." and alias takes operands, stating "OPTIONS: None.", which means POSIX _requires_ 'alias -- -=name' to (attempt to) define only the single alias '-', and NOT to also attempt to define '--' as an alias. It's okay if dash allows 'alias -=blah' to define '-' as an alias as an extension, but it MUST ignore '--' the way bash does. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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