xlcopy -f sys.program -f sys.program \
-n /tmp/sp.xl -s sys
This copies all rcds beginning with "sys" from the
sys.program file found in the XLDATA path to another
file called /tmp/sp.xl.
Both files have the same field layout defined by sys.program.
xlcopy -f sys.program -f sys.program -s sys -r tmp
This cmd copies all rcds beginning with "sys"
in the sys.program file to the same file,
but replacing the "sys" with "tmp".
This may add new rcds to the sys.program file,
or it may modify existing "tmp" rcds.