diff --git a/clitest.c b/clitest.c
index 6e38d88..834e539 100644
--- a/clitest.c
+++ b/clitest.c
@@ -304,6 +304,24 @@ int side_length_validator(struct cli_def *cli, const char *name, const char *val
   return rc;
 }
 
+int check1_validator(struct cli_def *cli, UNUSED(const char *name), UNUSED(const char *value)) {
+  char *color;
+  char *transparent;
+  
+  printf("check1_validator called \n");
+  color = cli_get_optarg_value(cli, "color", NULL);
+  transparent = cli_get_optarg_value(cli, "transparent", NULL);
+  
+  if (!color && !transparent) {
+    cli_error(cli,"\nMust supply either a color or transparent!");
+    return CLI_ERROR;
+  } else if (color && !strcmp(color,"black") && transparent) {
+    cli_error(cli, "\nCan not have a transparent black object!");
+    return CLI_ERROR;
+  }
+  return CLI_OK;
+}
+
 void run_child(int x) {
   struct cli_command *c;
   struct cli_def *cli;
@@ -352,11 +370,14 @@ void run_child(int x) {
                       "Set transparent flag", NULL, NULL, NULL);
   cli_register_optarg(c, "verbose", CLI_CMD_OPTIONAL_FLAG | CLI_CMD_OPTION_MULTIPLE, PRIVILEGE_UNPRIVILEGED, MODE_EXEC,
                       "Set transparent flag", NULL, NULL, NULL);
+  cli_register_optarg(c, "color", CLI_CMD_OPTIONAL_ARGUMENT, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Set color",
+                      color_completor, color_validator, NULL);
+  cli_register_optarg(c, "__check1__", CLI_CMD_SPOT_CHECK,PRIVILEGE_UNPRIVILEGED, MODE_EXEC,
+                      NULL, NULL, check1_validator,
+                      NULL);  
   cli_register_optarg(c, "shape", CLI_CMD_ARGUMENT | CLI_CMD_ALLOW_BUILDMODE, PRIVILEGE_UNPRIVILEGED, MODE_EXEC,
                       "Specify shape to calclate perimeter for", shape_completor, shape_validator,
                       shape_transient_eval);
-  cli_register_optarg(c, "color", CLI_CMD_OPTIONAL_ARGUMENT, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Set color",
-                      color_completor, color_validator, NULL);
   cli_register_optarg(c, "side_1", CLI_CMD_ARGUMENT, PRIVILEGE_UNPRIVILEGED, MODE_POLYGON_TRIANGLE,
                       "Specify side 1 length", NULL, side_length_validator, NULL);
   cli_register_optarg(c, "side_1", CLI_CMD_ARGUMENT, PRIVILEGE_UNPRIVILEGED, MODE_POLYGON_RECTANGLE,
diff --git a/libcli.c b/libcli.c
index 416b839..fae25e9 100644
--- a/libcli.c
+++ b/libcli.c
@@ -2307,9 +2307,10 @@ int cli_int_enter_buildmode(struct cli_def *cli, struct cli_pipeline_stage *stag
 
   // build new *limited* list of commands from this commands optargs
   for (optarg = stage->command->optargs; optarg; optarg = optarg->next) {
-    // don't allow anything that could redefine our mode or buildmode mode, or redefine exit/cancel
-    if (!strcmp(optarg->name, "cancel") || (!strcmp(optarg->name, "exit"))) {
-      cli_error(cli, "Unable to build buildmode mode from optarg named %s", optarg->name);
+    // don't allow anything that could redefine our mode or buildmode mode, or redefine exit/cancel/show/unset
+    if (!strcmp(optarg->name, "cancel") || (!strcmp(optarg->name, "exit")) ||
+        !strcmp(optarg->name, "show") || (!strcmp(optarg->name, "unset"))) {
+      cli_error(cli, "Default buildmode command conflicts with optarg named %s", optarg->name);
       rc = CLI_BUILDMODE_ERROR;
       goto out;
     }
@@ -2343,7 +2344,7 @@ int cli_int_enter_buildmode(struct cli_def *cli, struct cli_pipeline_stage *stag
     }
   }
   cli->buildmode->cname = strdup(cli_command_name(cli, stage->command));
-  // and lastly two 'always there' commands to cancel current mode and to execute the command
+  // and lastly four 'always there' commands to cancel current mode and to execute the command, show settings, and unset 
   cli_int_register_buildmode_command(cli, NULL, "cancel", cli_int_buildmode_cancel_cback, PRIVILEGE_UNPRIVILEGED,
                                      cli->mode, "Cancel command");
   cli_int_register_buildmode_command(cli, NULL, "exit", cli_int_buildmode_exit_cback, PRIVILEGE_UNPRIVILEGED, cli->mode,
@@ -3000,7 +3001,14 @@ static void cli_int_parse_optargs(struct cli_def *cli, struct cli_pipeline_stage
        * Otherwise if the word is 'blank', could be an argument, or matches 'enough' of an option/flag it is a candidate
        * Once we accept an argument as a candidate, we're done looking for candidates as straight arguments are required
        */
-      if (stage->words[w_idx] && (oaptr->flags & (CLI_CMD_OPTIONAL_FLAG | CLI_CMD_OPTIONAL_ARGUMENT)) &&
+      if ((oaptr->flags & CLI_CMD_SPOT_CHECK) && (num_candidates == 0)) {
+        stage->status = (*oaptr->validator)(cli, NULL, NULL);
+        if (stage->status != CLI_OK) {
+          stage->error_word = stage->words[w_idx];
+          cli_reprompt(cli);
+          return;
+        }
+      } else if (stage->words[w_idx] && (oaptr->flags & (CLI_CMD_OPTIONAL_FLAG | CLI_CMD_OPTIONAL_ARGUMENT)) &&
           !strcmp(oaptr->name, stage->words[w_idx])) {
         candidates[0] = oaptr;
         num_candidates = 1;
@@ -3035,7 +3043,7 @@ static void cli_int_parse_optargs(struct cli_def *cli, struct cli_pipeline_stage
     /*
      * So now we could have one or more candidates.  We need to call get help/completions *only* if this is the
      * 'last-word'
-     * Remember that last word for optinal arguments is last or next to last....
+     * Remember that last word for optional arguments is last or next to last....
      */
     if (lastchar != '\0') {
       int called_comphelp = 0;
diff --git a/libcli.h b/libcli.h
index f2c6022..73cafa7 100644
--- a/libcli.h
+++ b/libcli.h
@@ -132,6 +132,7 @@ enum optarg_flags {
   CLI_CMD_DO_NOT_RECORD = 1 << 7,
   CLI_CMD_REMAINDER_OF_LINE = 1 << 8,
   CLI_CMD_HYPHENATED_OPTION = 1 << 9,
+  CLI_CMD_SPOT_CHECK = 1 << 10,
 };
 
 struct cli_optarg {