Library /sys$common/syshlp/sda.hlb SPAWN, /INPUT=file-spec  *Conan The Librarian (sorry for the slow response - running on an old VAX)

     Specifies an input file containing one or more command strings to
     be executed by the spawned subprocess.  If you specify a command
     string along with an input file, the command string is processed
     before the commands in the input file.  Once processing is
     complete, the subprocess is terminated.