Multi Level Bash Completion

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Thanks to mkb’s comment, I looked into the p4 example, which was—unlike the Git example—simple enough for me to adapt to my case. Here is the working version which does exactly what I asked for:

have pbt &&
_pbt_complete()
{
  local cur prev

  COMPREPLY=()
  cur=${COMP_WORDS[COMP_CWORD]}
  prev=${COMP_WORDS[COMP_CWORD-1]}

  if [ $COMP_CWORD -eq 1 ]; then
    COMPREPLY=( $(compgen -W "asadmin deploy" -- $cur) )
  elif [ $COMP_CWORD -eq 2 ]; then
    case "$prev" in
      "asadmin")
        COMPREPLY=( $(compgen -W "start-domain stop-domain" -- $cur) )
        ;;
      "deploy")
        COMPREPLY=( $(compgen -W "all current" -- $cur) )
        ;;
      *)
        ;;
    esac
  fi

  return 0
} &&
complete -F _pbt_complete pbt

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