Array parameter for supplementary groups?

Array parameter for supplementary groups?

[Benjamin R. Haskell]

Is there an array parameter for the group IDs of the current user?  Am I 
overlooking it?

Under Cygwin under Windows 7, right-click run-as-administrator adds some 
supplementary groups, but the user is otherwise indistinguishable, 
AFAICT.  I'd like to be able to do something like:

(( $+groups[(Re)0] )) && { do stuff for admin-style prompt }

without resorting to parsing the output of `id`.  (examples:)

running as normal:
uid=12522(bhaskell) gid=10513(Domain Users) groups=10513(Domain Users),545(Users)

running as admin:
uid=12522(bhaskell) gid=10513(Domain Users) groups=10513(Domain Users),0(root),544(Administrators),545(Users)

(I just dislike parsing when it's not necessary.)

-- 
Best,
Ben

Re: Array parameter for supplementary groups?

[Dan Nelson]

In the last episode (Jan 18), Benjamin R. Haskell said:
> Is there an array parameter for the group IDs of the current user?  Am I 
> overlooking it?
> 
> Under Cygwin under Windows 7, right-click run-as-administrator adds some 
> supplementary groups, but the user is otherwise indistinguishable, 
> AFAICT.  I'd like to be able to do something like:
> 
> (( $+groups[(Re)0] )) && { do stuff for admin-style prompt }
> 
> without resorting to parsing the output of `id`.  (examples:)

Parsing the output of "groups" or "id -G" is simpler, btw.  A builtin with
this info would be nice, though :)

-- 
	Dan Nelson
	dnelson@allantgroup.com

Re: Array parameter for supplementary groups?

[Peter Stephenson]

On Tue, 18 Jan 2011 13:27:53 -0500 (EST)
"Benjamin R. Haskell" <zsh@benizi.com> wrote:
> Is there an array parameter for the group IDs of the current user?  Am I 
> overlooking it?

No, but if you speak Unreadable you can create one quite quickly...

idgroups() {
  emulate -L zsh
  setopt extendedglob
  typeset -gA groups
  groups=(
${=${${(s.,.)${${$(id):#^groups=*}##groups=}}/(#b)(*)\((*)\)/$match[2]\
 $match[1]}}
)
}         

Of course if we had discipline functions blah blah blah.

-- 
Peter Stephenson <p.w.stephenson@ntlworld.com>
Web page now at http://homepage.ntlworld.com/p.w.stephenson/