In addition to the two-way pipe proble, I think your die is in the wrong place too. You want to die if the open failed, so it should be outside the parentheses.

open(HANDLE, "|cmd ss get $/Tate_SP2/$dir/$fname -Ybarbarat,12345|" ) 
+|| die "Couldn't run pro
+cess:$!";
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instead of

open(HANDLE, "|cmd ss get $/Tate_SP2/$dir/$fname -Ybarbarat,12345|" ||
+ die "Couldn't run pro
+cess:$!" );
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