(CommandList
  children: [
    (C {(echo)} {(SQ <'--- envuidgid insists on two arguments'>)})
    (Sentence child:(C {(envuidgid)}) terminator:<Op_Semi ';'>)
    (C {(echo)} {($ VSub_QMark '$?')})
    (Sentence child:(C {(envuidgid)} {(root)}) terminator:<Op_Semi ';'>)
    (C {(echo)} {($ VSub_QMark '$?')})
    (C {(echo)} {(SQ <'--- envuidgid sets UID=0 for root'>)})
    (Sentence child:(C {(envuidgid)} {(root)} {(printenv)} {(UID)}) terminator:<Op_Semi ';'>)
    (C {(echo)} {($ VSub_QMark '$?')})
    (C {(echo)} {(SQ <'--- envuidgid complains if it cannot run program'>)})
    (Sentence child:(C {(envuidgid)} {(root)} {(./nonexistent)}) terminator:<Op_Semi ';'>)
    (C {(echo)} {($ VSub_QMark '$?')})
  ]
)