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print("Hello\n");
$ret=`echo dog`;
...
# copy a file
$ret=`copy c:\\perl_test\\test.sas c:\\perl_test\\test_new.sas`;
print("step 4 \$ret is $ret/n");

Hello
step 1 $ret is dog
...
step 2 $SAScmd is c:\apps\sas\sas9~1.1\sas.exe
step 3 $ret is 
step 4 $ret is          1 file(s) copied.

Hello
step 1 $ret is 
step 2 $SAScmd is c:\apps\sas\sas9~1.1\sas.exe
step 3 $ret is 
step 4 $ret is