(List
  (Com {[LIT_CHARS set]} {[LIT_CHARS -o]} {[LIT_CHARS nounset]})
  (Com {[LIT_CHARS set]} {[LIT_CHARS -o]} {[LIT_CHARS errexit]})
  (FunctionDef ReadKey []
    (Com {[LIT_CHARS read]})
  )
  (FunctionDef Banner []
    (List
      (Com {[LIT_CHARS echo]} {[DQ [LIT_CHARS "######################################################################"]]})
      (Com {[LIT_CHARS echo]} {[VarSub *]})
      (Com {[LIT_CHARS echo]} {[DQ [LIT_CHARS "######################################################################"]]})
    )
  )
  (FunctionDef Download []
    (List
      (Com {[LIT_CHARS Banner]} {[DQ [LIT_CHARS "downloading "][VarSub 1]]})
      (If
        (Com {[LIT_CHARS which]} {[LIT_CHARS wget]})
        (Com {[LIT_CHARS wget]} {[VarSub 1]} {[LIT_CHARS -O]} {[VarSub 2]})
        (Com {[LIT_CHARS which]} {[LIT_CHARS curl]})
        (Com {[LIT_CHARS curl]} {[LIT_CHARS --url]} {[VarSub 1]} {[LIT_CHARS -o]} {[VarSub 2]})
        (ElseTrue)
        (List
          (Com {[LIT_CHARS echo]})
          (Com {[LIT_CHARS echo]} {[DQ [LIT_CHARS "Problem encountered"]]})
          (Com {[LIT_CHARS echo]})
          (Com {[LIT_CHARS echo]} {[DQ [LIT_CHARS "Please install curl or wget and rerun this script"]]})
          (Com {[LIT_CHARS echo]} {[DQ [LIT_CHARS "or manually download "][VarSub 1][LIT_CHARS " to "][VarSub 2]]})
          (Com {[LIT_CHARS echo]})
          (Com {[LIT_CHARS echo]} {[DQ [LIT_CHARS "press any key when done"]]})
          (Com {[LIT_CHARS ReadKey]})
        )
      )
      (If
        (Com {[LIT_OTHER "["]} {[LIT_OTHER "!"]} {[LIT_CHARS -s]} {[VarSub 2]} {[LIT_OTHER "]"]})
        (List
          (Com {[LIT_CHARS echo]} {[DQ [LIT_CHARS "ERROR: could not find "][VarSub 2]]})
          (Com {[LIT_CHARS exit]} {[LIT_CHARS -1]})
        )
      )
    )
  )
  (If
    (Com {[LIT_OTHER "["]} {[VarSub #]} {[LIT_CHARS -ne]} {[LIT_CHARS 2]} {[LIT_OTHER "]"]})
    (List
      (Com {[LIT_CHARS echo]} {[DQ [LIT_CHARS "usage: download.sh <url> <localfilename>"]]})
      (Com {[LIT_CHARS exit]} {[LIT_CHARS -1]})
    )
  )
  (Com {[LIT_CHARS Download]} {[VarSub 1]} {[VarSub 2]})
)