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#compdef chsh chpass

local variant help=h
local -a args shells

case $OSTYPE in
  darwin*|*bsd*)
    args=( '(-a)-s[specify new login shell]:shell:($shells)' )
  ;|
  (free|net|open)bsd*)
    args+=( '(-s 1)-a[specify user database entry]:passwd entry' )
  ;|
  darwin*)
    args+=(
      '-l[specify location of user]:location'
      '-u[specify authentication name]:auth user'
    )
  ;;
  (free|net)bsd*)
    args+=(
      '(-y)-l[update only the local password file]'
      '(-l)-y[force YP database entry to be changed]'
    )
  ;|
  freebsd*)
    args+=(
      '-p[specify encrypted password field]:password hash'
      '-e[change account expire time]:expiry time'
      '-d[specify NIS domain]:domain'
      '-h[specify NIS server to query]:NIS server:_hosts'
      '-o[force use of RPC-based updates]'
    )
  ;;
  (linux-gnu)
    _pick_variant -r variant util-linux=util-linux suse=pwdutils debian -v
    args=( -S : '(-)'{-s+,--shell=}'[specify new login shell]:shell:($shells)' )
    case $variant in
      suse|util-linux)
	shells=( $(_call_program shells $words[1] -l) )
        args+=(
	  '(-)'{-l,--list-shells}'[print shells in /etc/shells]'
	  '(-)'{-v,--version}'[display version information]'
        )
	help=u
      ;|
      util-linux|debian)
	args+=( '(-)-'{$help,-help}'[display help information]' )
      ;|
      suse)
        args+=(
	  '(-)'{-u,--usage}'[display short usage message]'
	  '(-)--help[display help information]'
	  '(-D --binddn)'{-D+,--binddn=}'[specify LDAP disingushed name to bind]:binddn'
	  '(-P --path)'{-P+,--path=}'[specify path to search for passwd and shadow files]:path:_directories'
	  '(-q --quiet)'{-q,--quiet}"[don't be verbose]"
	  '--service=[use specified name service]:service:(files nis nisplus ldap)'
	)
      ;;
      debian)
	args+=( '(-R --root)'{-R+,--root=}'[specify directory to chroot into]:directory:_directories' )
      ;;
    esac
  ;;
esac

(( $#shells )) || shells=( ${(Z+Cn+)"$(</etc/shells)"} )
_arguments $args '1:user name:_users'