On 09/30/2013 08:21 AM, Eric Blake wrote: > Case in point: have you ever typed 'grep --help' to see what grep can > do, or 'grep --version' to see what build you are using? Well, such a > command line is not permissible of a strictly conforming use of grep > (ie. POSIX states that it is undefined behavior to pass a command line > argument that has a length larger than 2 and which starts with two > dashes).
Since we're playing the role of pedantry here, let me amend that: POSIX states that it is undefined behavior to pass a command line argument that has a length larger than 2 and which starts with two dashes, IFF you did not first pass the '--' end-of-options argument. (The behavior of 'grep -- --help' is well-defined: search for lines of stdin that match the regular expression "--help".) -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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