- BBTK_INPUT(ExecSystemCommand,In,"system (O.S.) commands separated by ';' , use '' to indicate strings ex. help 'graph' ",std::string,"");
+ BBTK_INPUT(ExecSystemCommand,In,"system (O.S.) commands separated by ';' , use '' to indicate strings ex. help 'graph' ",std::string,"");
+ BBTK_OUTPUT(ExecSystemCommand,Return,"result (0 if no error or error number of the first error",int,"");