LUA - it is safe to drive SAS

PROC LUA can create safe environment to drive SAS because you don't worry about changing any existing library, fileref, macros and global options outside LUA session. Furthermore, you can also setup new library, fileref, macros and global options in LUA session. It will maintain all of them inside LUA session until it terminates or restarts.

Below are the sample code to demonstrate the concepts:

filename test temp;
libname test "c:\";
%macro test;
    %put outside;
%mend;

proc lua restart;
submit;
sas.submit [[
/* It will fail to delete existing fileref or library */
filename test clear;
libname test clear;
]]
endsubmit;
run;

proc lua restart;
submit;
sas.submit [[
filename test temp;
libname test "c:\temp";
options obs=0;
%macro test;
    %put inside;
%mend;

filename test list;
libname test list;
proc options option=obs; run;
%test
]]
endsubmit;
run;

filename test list;
libname test list;
proc options option=obs; run;
%test