(command.CommandList
  children: [
    (command.If
      if_kw: <Id.KW_If if>
      arms: [
        (IfArm
          keyword: <Id.KW_If if>
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
                    (command.Simple
                      blame_tok: <Id.Lit_LBracket '['>
                      more_env: []
                      words: [
                        {<Id.Lit_LBracket '['>}
                        {($ Id.VSub_Pound '#')}
                        {<-ne>}
                        {<2>}
                        {<Id.Lit_RBracket ']'>}
                      ]
                      redirects: []
                      do_fork: T
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          then_kw: <Id.KW_Then then>
          action: [
            (command.Simple
              blame_tok: <echo>
              more_env: []
              words: [{<echo>} {(DQ <'Usage '> ($ Id.VSub_Number 0) <' from to'>)}]
              redirects: [(Redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (command.Simple
              blame_tok: <echo>
              more_env: []
              words: [{<echo>} {(DQ <'for e.g. '> ($ Id.VSub_Number 0) <' \'2 grams\' drams'>)}]
              redirects: [(Redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (command.ControlFlow keyword:<Id.ControlFlow_Exit exit>)
          ]
          spids: [15 28]
        )
      ]
      else_action: []
      fi_kw: <Id.KW_Fi fi>
      redirects: []
    )
    (command.Simple
      blame_tok: <units>
      more_env: []
      words: [{<units>} {<-t>} {(DQ ($ Id.VSub_Number 1))} {(DQ ($ Id.VSub_Number 2))}]
      redirects: []
      do_fork: T
    )
  ]
)