Library /sys$common/syshlp/dtehelp.hlb SPAWN, /OUTPUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /OUTPUT=filespec

    Specifies the output file to which the results of the SPAWN
    operation are written. No wildcards can be used in the file
    specification. (Do not specify SYS$COMMAND as a file specification
    for the /OUTPUT qualifier when using the /NOWAIT qualifier: both
    parent and subprocess output will be displayed simultaneously on
    your terminal.)