_opsk() {
     local cur prev opts
     COMPREPLY=()
     cur="${COMP_WORDS[COMP_CWORD]}"
     prev="${COMP_WORDS[COMP_CWORD-1]}"
     opts="generate help package specgen version"
 
     if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
         COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
         return 0
     fi

     case "${prev}" in
          help)
                COMPREPLY=( $(compgen -W "${opts/help/}" -- ${cur}) )
          ;;
     esac    
    }
complete -F _opsk opsk