Experimental Physics and
Industrial Control System

StreamDevice can do that.
You will have to write iocsh function, which you can call from StreamDevice.
That iocsh function (programmed in C/C++) will call the system C-function with your script as an argument.
Note that to use StreamDevice, you don't need a physical device (i.e. your protocol can just call your function)

int dmc2183_escapeToShell(const char *p_command) {
  int status;
 
  status=system(p_command);
  switch(status) {
    case ERROR:
       printf("[ERROR] %s\n", p_command);
       break;
    case SUCCESS:
       funcLog(7, __FILE__ "[%d] SUCCESS\n", __LINE__);
       break;
    default:
       printf("[ERROR] status=%d\n", status);
       break;
   }
   return(SUCCESS);
}

static const iocshArg dmc2183_escapeToShellArg0 = {"Command", iocshArgString};
static const iocshArg* const dmc2183_escapeToShellArgs[1] = {
  &dmc2183_escapeToShellArg0};
static const iocshFuncDef dmc2183_escapeToShellFuncDef = { "dmc2183_escapeToShell",1,dmc2183_escapeToShellArgs};
static void dmc2183_escapeToShellCallFunc(const iocshArgBuf* args) { dmc2183_escapeToShell(args[0].sval);
}

static void DMC2183_iocshFuncRegistrar (void) {
  iocshRegister( &dmc2183_escapeToShellFuncDef, dmc2183_escapeToShellCallFunc);
}
epicsExportRegistrar(DMC2183_iocshFuncRegistrar);


Enjoy,
--
Emmanuel