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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <140822210846.ZM22535@torch.brasslantern.com>
Date: Fri, 22 Aug 2014 21:08:46 -0700
In-reply-to: <53F67562.2030102@gmx.net>
Comments: In reply to qcd <qcd@gmx.net>        "Bug path completion chsh -s"
 (Aug 22, 12:40am)
References: <53F67562.2030102@gmx.net>
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To: qcd@gmx.net, zsh-workers@zsh.org
Subject: Re: Bug path completion chsh -s
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On Aug 22, 12:40am, qcd wrote:
} 
} > chsh -s <tab>
} 
} in  normal shellproposes  a path list but in zsh that does not work.

What is "normal shell"?  Bash?  What version?  Are you on a single-user
system you set up yourself, or are you at a school or business where an
administrator has pre-configured the "normal shell"?

Also, chsh has different syntax on different OS's:  On MacOS it's an
alias for chpass; on Ubuntu it only has --help and --shell options
(and their -h -s counterparts); on RHEL it has several options and
uses -u instead of -h for --help, and adds -l for --list, both of
which conflict with chpass on MacOs; and so on.  So "please fix" is
a rather open-ended request.

Oh well, never mind.  Here's something for RHEL; perhaps you can figure
out how to fix it for your local environment, or just remove everything
except -s, given that's the one thing they all seem to have in common.

---- 8< ---- name this _chsh and put in an fpath directory ---- 8< ----
#compdef chsh
local -a opts
opts=(-s -l -u -v --shell --list-shells --help --version)
_arguments : \
   "($opts)-s[Specify your login shell]:shell:($(</etc/shells))" \
   "($opts)--shell[Specify your login shell]:shell:($(</etc/shells))" \
   "($opts)-l[Print shells in /etc/shells]" \
   "($opts)--list-shells[Print shells in /etc/shells]" \
   "($opts)-u[Print a usage message and exit]" \
   "($opts)--help[Print a usage message and exit]" \
   "($opts)-v[Print version information and exit]" \
   "($opts)--version[Print version information and exit]"
---- 8< ---- snip ---- 8< ---- -------- ---- 8< ---- snip ---- 8< ----

Maybe somebody else can remind me if there's an easier way to indicate
to _arguments that all the arguments are mutually exclusive.  (RedHat
chsh accepts more than one but only uses the first one it encounters.)