(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:tid)
          op: assign_op.Equal
          rhs: {(DQ <'transfer data'>)}
          spids: [7]
        )
      ]
    )
    (command.ForEach
      iter_name: p
      iter_words: [{(${ Id.VSub_Name SSH_PROTOCOLS)}]
      do_arg_iter: F
      body: 
        (command.DoGroup
          children: [
            (C {<verbose>} {(DQ ($ Id.VSub_DollarName '$tid') <': proto '> ($ Id.VSub_DollarName '$p'))})
            (C {<rm>} {<-f>} {(${ Id.VSub_Name COPY)})
            (command.Simple
              words: [
                {(${ Id.VSub_Name SSH)}
                {<-n>}
                {<-q>}
                {<-> ($ Id.VSub_DollarName '$p')}
                {<-F>}
                {($ Id.VSub_DollarName '$OBJ') <'/ssh_proxy'>}
                {<somehost>}
                {<cat>}
                {(${ Id.VSub_Name DATA)}
              ]
              redirects: [
                (redir
                  op: <Id.Redir_Great '>'>
                  loc: (redir_loc.Fd fd:1)
                  arg: {(${ Id.VSub_Name COPY)}
                )
              ]
              do_fork: T
            )
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (C {<Id.Lit_LBracket '['>} {($ Id.VSub_QMark '$?')} {<-ne>} {<0>} 
                              {<Id.Lit_RBracket ']'>}
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [(C {<fail>} {(DQ <'ssh cat '> ($ Id.VSub_DollarName '$DATA') <' failed'>)})]
                  spids: [76 89]
                )
              ]
            )
            (command.AndOr
              ops: [Id.Op_DPipe]
              children: [
                (C {<cmp>} {(${ Id.VSub_Name DATA)} {(${ Id.VSub_Name COPY)})
                (C {<fail>} {(DQ <'corrupted copy'>)})
              ]
            )
            (command.ForEach
              iter_name: s
              iter_words: [{<10>} {<100>} {<1k>} {<32k>} {<64k>} {<128k>} {<256k>}]
              do_arg_iter: F
              body: 
                (command.DoGroup
                  children: [
                    (C {<trace>} 
                      {(DQ <'proto '> ($ Id.VSub_DollarName '$p') <' dd-size '> (${ Id.VSub_Name s))}
                    )
                    (C {<rm>} {<-f>} {(${ Id.VSub_Name COPY)})
                    (command.Pipeline
                      children: [
                        (command.Simple
                          words: [
                            {<dd>}
                            {<Id.Lit_VarLike 'if='> ($ Id.VSub_DollarName '$DATA')}
                            {<Id.Lit_VarLike 'obs='> (${ Id.VSub_Name s)}
                          ]
                          redirects: [
                            (redir
                              op: <Id.Redir_Great '2>'>
                              loc: (redir_loc.Fd fd:2)
                              arg: {<'/dev/null'>}
                            )
                          ]
                          do_fork: T
                        )
                        (C {(${ Id.VSub_Name SSH)} {<-q>} {<-> ($ Id.VSub_DollarName '$p')} {<-F>} 
                          {($ Id.VSub_DollarName '$OBJ') <'/ssh_proxy'>} {<somehost>} {(DQ <'cat > '> (${ Id.VSub_Name COPY))}
                        )
                      ]
                      negated: F
                    )
                    (command.If
                      arms: [
                        (if_arm
                          cond: 
                            (condition.Shell
                              commands: [
                                (command.Sentence
                                  child: 
                                    (C {<Id.Lit_LBracket '['>} {($ Id.VSub_QMark '$?')} {<-ne>} {<0>} 
                                      {<Id.Lit_RBracket ']'>}
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          action: [
                            (C {<fail>} {(DQ <'ssh cat '> ($ Id.VSub_DollarName '$DATA') <' failed'>)})
                          ]
                          spids: [211 224]
                        )
                      ]
                    )
                    (command.AndOr
                      ops: [Id.Op_DPipe]
                      children: [
                        (C {<cmp>} {($ Id.VSub_DollarName '$DATA')} {(${ Id.VSub_Name COPY)})
                        (C {<fail>} {(DQ <'corrupted copy'>)})
                      ]
                    )
                  ]
                )
            )
          ]
        )
    )
    (C {<rm>} {<-f>} {(${ Id.VSub_Name COPY)})
  ]
)