set i 0
while {$i < $argc} {
  if ![string compare "-m" [lindex $argv $i]] {
    incr i
    if $i==$argc {
      send_user "-m specified without machine, FAILING"
      exit -3
    }
    set machine [lindex $argv $i]
  } elseif ![string compare "-n" [lindex $argv $i]] {
    incr i
    if $i==$argc {
      send_user "-n specified without name, FAILING"
      exit -3
    }
    set name [lindex $argv $i]
  } elseif ![string compare "-p" [lindex $argv $i]] {
    incr i
    if $i==$argc {
      send_user "-p specified without password, FAILING"
      exit -3
    }
    set password [lindex $argv $i]
  } elseif ![string compare "-c" [lindex $argv $i]] {
    incr i
    if $i==$argc {
      send_user "-c specified without argument, FAILING"
      exit -3
    }
    set cmd [lindex $argv $i]
  }
  incr i
}