On 01/16/2011 03:54 PM, Michał Piotrowski wrote: > Hi, > > I wonder why such a thing is possible > [michal@ozzy ~]$ cd / > [michal@ozzy /]$ pwd > / > [michal@ozzy /]$ cd // > [michal@ozzy //]$ pwd > //
Because POSIX says that leading // is allowed (but not required) to have a separate interpretation from / (no other spelling gets this special treatment; leading /// must be identical to leading /). Some systems, like Cygwin, use this POSIX requirement to implement an alternate access space, where //server/share is used, in perfect compliance with POSIX, to represent windows remote share drives. Since bash is ported to cygwin, the bash maintainer chose to preserve // as special for all systems, whether or not it actually is special. On Linux, it happens to not be special. Other shells, like zsh, only treat // as special on platforms where it really is special, and collapse it to / otherwise. However, you have not pointed out any bugs - since POSIX is explicit that // is special, you are better off avoiding // and not worrying about whether a program collapses // into /. -- Eric Blake ebl...@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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