1 $! generates options file for vms link
2 $! p1 is filename and mode to open file (filename/write or filename/append)
3 $! p2 is delimiter separating elements of list in p3
4 $! p3 is list of items to be written, one per line, into options file
9 $ x=f$element(element,p2,p3)
10 $ if x .eqs. p2 then goto out
11 $ y=f$edit(x,"COLLAPSE") ! lose spaces
12 $ if y .nes. "" then write file y