Add option to discard command output

src/common/shell/commander/commander.c

@@ -101,7 +101,7 @@ internal inline CMDError get_command_output(FILE *fp,
       }
 
       strcat(out_buf, out);
-    } else {
+    } else if (out_handling == SHELL_OUTPUT_PRINT) {
       printf("%s", out);
     }
   }