When the last line in a script file is not an empty line the Shell will not execute the command in the last line. The patch refine the logic in function 'ShellFileHandleReturnLine' and fix the issue. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jaben Carsey <jaben.carsey@intel.com> Reviewed-by: Qiu Shumin <shumin.qiu@intel.com>