Do you know where physical path is?
Simple code could be:
data _null_;
path = "&physical_path";
rc = filename("flref",path);
did = dopen("flref");
end = dnum(did);
put end;
do i = 1 to end;
filename = strip(dread(did,i));
put filename;
end;
rc = close(did);
run;
Although, this code does not drill down to sub-directories.
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