diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index 6f324410e1..d8197aa740 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -50,6 +50,7 @@
 #include "cli/cli-cmds.h"
 #include "cli/cli-style.h"
 #include "cli/cli-utils.h"
+#include "cli/cli-style.h"
 
 #include "extension.h"
 #include "gdbsupport/pathstuff.h"
@@ -230,6 +231,7 @@ with_command_1 (const char *set_cmd_prefix,
     nested_cmd = repeat_previous ();
 
   cmd_list_element *set_cmd = lookup_cmd (&args, setlist, set_cmd_prefix,
+					  nullptr,
 					  /*allow_unknown=*/ 0,
 					  /*ignore_help_classes=*/ 1);
   gdb_assert (set_cmd != nullptr);
@@ -324,6 +326,146 @@ with_command_completer (struct cmd_list_element *ignore,
   with_command_completer_1 ("set ", tracker,  text);
 }
 
+/* Completer for the "set|show default-args" commands.  */
+
+static void
+default_args_cmd_completer (struct cmd_list_element *ignore,
+			    completion_tracker &tracker,
+			    const char *text, const char *word)
+{
+  tracker.set_use_custom_word_point (true);
+
+  complete_nested_command_line (tracker, text);
+}
+
+/* Look up the contents of TEXT as a command usable with default args.
+   Throws an error if no such command is found.
+   Return the found command and advances TEXT past the found command.
+   If the found command is a postfix command, set *PREFIX_CMD to its prefix command.  */
+
+static struct cmd_list_element *
+lookup_cmd_for_default_args (const char **text,
+			     struct cmd_list_element **prefix_cmd)
+{
+  const char *orig_text = *text;
+  struct cmd_list_element *lcmd, *alias, *cmd;
+
+  if (*text == nullptr || skip_spaces (*text) == nullptr)
+    error (_("COMMAND missing."));
+
+  /* We first use lookup_cmd to verify TEXT unambiguously identifies
+     a command.  */
+  lcmd = lookup_cmd (text, cmdlist, "", NULL,
+		     /*allow_unknown=*/ 0,
+		     /*ignore_help_classes=*/ 1);
+
+  /* Note that we accept default args for prefix commands,
+     as a prefix command can also be a valid usable
+     command accepting some arguments.
+     For example, "thread apply" applies a command to a
+     list of thread ids, and is also the prefix command for
+     thread apply all.  */
+
+  /* We have an unambiguous command for which default args
+     can be specified.  What remains after having fond LCMD
+     is either spaces, or the default args character.  */
+
+  /* We then use lookup_cmd_composition to detect if the user
+     has specified an alias, and find the possible prefix_cmd
+     of cmd.  */
+  lookup_cmd_composition
+    (std::string (orig_text, *text - orig_text).c_str (),
+     &alias, prefix_cmd, &cmd);
+  gdb_assert (cmd != nullptr);
+  gdb_assert (cmd == lcmd);
+  if (alias != nullptr)
+    cmd = alias;
+
+  return cmd;
+}
+
+/* Implementation of the "set default-args" command.  */
+
+static void
+set_default_args_command (const char *arg, int from_tty)
+{
+  struct cmd_list_element *prefix_cmd;
+  struct cmd_list_element *cmd = lookup_cmd_for_default_args (&arg, &prefix_cmd);
+
+  const char *default_args = skip_spaces (arg);
+
+  if (*default_args == '\0')
+    default_args = nullptr;
+
+  if (cmd->default_args)
+    xfree ((char *) cmd->default_args);
+  if (default_args == nullptr)
+    cmd->default_args = nullptr;
+  else
+    cmd->default_args = xstrdup (default_args);
+}
+
+/* Print a message showing C's name and its default args or <no default args>
+   if C has no default args.
+   If SILENT_FOR_NO_DEFAULT_ARGS, does nothing if C has no default args.  */
+
+static void
+show_default_args (struct cmd_list_element *c,
+		   const char *prefix,
+		   bool silent_for_no_default_args)
+{
+  if (c->default_args != nullptr || !silent_for_no_default_args)
+    {
+      fputs_filtered ("default-args ", gdb_stdout);
+      fprintf_styled (gdb_stdout, title_style.style (),
+		      "%s%s",
+		      prefix == nullptr ? "" : prefix, c->name);
+      fprintf_filtered (gdb_stdout, " = %s\n",
+			c->default_args == nullptr
+			? "<no default args>" : c->default_args);
+    }
+}
+
+/* Recursively traverse COMMANDLIST and prints a message showing
+   the default-args of the commands that have non-null default args.
+   PREFIX is the prefix that led to COMMANDLIST.  */
+
+static void
+show_default_args_command_1 (struct cmd_list_element *commandlist,
+			     const char *prefix)
+{
+  /* Walk through the commands.  */
+  for (cmd_list_element *c = commandlist; c; c = c->next)
+    {
+      show_default_args (c, prefix, true);
+      /* If C has subcommands, recursively search if its subcommands
+	 have default args.
+	 Do not recurse for abbreviations to avoid duplicates
+	 in the output.  */
+      if (c->prefixlist != NULL && !c->abbrev_flag)
+	show_default_args_command_1 (*c->prefixlist, c->prefixname);
+    }
+}
+
+/* Implementation of the "show default-args" command.  */
+
+static void
+show_default_args_command (const char *arg, int from_tty)
+{
+  if (skip_spaces (arg) != nullptr)
+    {
+      struct cmd_list_element *prefix_cmd;
+      struct cmd_list_element *c = lookup_cmd_for_default_args (&arg,
+								&prefix_cmd);
+
+      show_default_args (c,
+			 prefix_cmd == nullptr ? "" : prefix_cmd->prefixname,
+			 false);
+    }
+  else
+    show_default_args_command_1 (cmdlist, "");
+}
+
 
 /* Provide documentation on command or list given by COMMAND.  FROM_TTY
    is ignored.  */
@@ -1550,7 +1692,7 @@ show_user (const char *args, int from_tty)
     {
       const char *comname = args;
 
-      c = lookup_cmd (&comname, cmdlist, "", 0, 1);
+      c = lookup_cmd (&comname, cmdlist, "", NULL, 0, 1);
       if (!cli_user_command_p (c))
 	error (_("Not a user command."));
       show_user_1 (c, "", args, gdb_stdout);
@@ -1582,6 +1724,71 @@ apropos_command (const char *arg, int from_tty)
   apropos_cmd (gdb_stdout, cmdlist, verbose, pattern, "");
 }
 
+/* The options for the "alias" command.  */
+
+struct alias_opts
+{
+  /* For "-a".  */
+  bool abbrev_flag = 0;
+};
+
+static const gdb::option::option_def alias_option_defs[] = {
+
+  gdb::option::flag_option_def<alias_opts> {
+    "a",
+    [] (alias_opts *opts) { return &opts->abbrev_flag; },
+    N_("Specify that ALIAS is an abbreviation of COMMAND.\n\
+Abbreviations are not shown in command lists displayed by the 'help' command."),
+  },
+
+};
+
+/* Create an option_def_group for the "alias" options, with
+   A_OPTS as context.  */
+
+static inline gdb::option::option_def_group
+make_alias_options_def_group (alias_opts *a_opts)
+{
+  return {{alias_option_defs}, a_opts};
+}
+
+/* Completer for the "alias_command".  */
+
+static void
+alias_command_completer (struct cmd_list_element *ignore,
+			 completion_tracker &tracker,
+			 const char *text, const char *word)
+{
+  const auto grp = make_alias_options_def_group (nullptr);
+
+  tracker.set_use_custom_word_point (true);
+
+  if (gdb::option::complete_options
+      (tracker, &text, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_ERROR, grp))
+    return;
+
+  const char *delim = strstr (text, "=");
+
+  /* If we're past the "=" delimiter, complete the
+     "alias ALIAS = COMMAND [DEFAULT-ARGS...]" as if the user is
+     typing COMMAND DEFAULT-ARGS...  */
+  if (delim != text
+      && delim != nullptr
+      && isspace (delim[-1])
+      && (isspace (delim[1]) || delim[1] == '\0'))
+    {
+      std::string new_text = std::string (delim + 1);
+
+      tracker.advance_custom_word_point_by (delim + 1 - text);
+      complete_nested_command_line (tracker, new_text.c_str ());
+      return;
+    }
+
+  /* We're not yet past the "=" delimiter.  Complete a command, as
+     the user might type an alias following a prefix command.  */
+  complete_nested_command_line (tracker, text);
+}
+
 /* Subroutine of alias_command to simplify it.
    Return the first N elements of ARGV flattened back to a string
    with a space separating each element.
@@ -1616,7 +1823,7 @@ valid_command_p (const char *command)
 {
   struct cmd_list_element *c;
 
-  c = lookup_cmd_1 (& command, cmdlist, NULL, 1);
+  c = lookup_cmd_1 (& command, cmdlist, NULL, NULL, 1);
 
   if (c == NULL || c == (struct cmd_list_element *) -1)
     return false;
@@ -1634,7 +1841,7 @@ valid_command_p (const char *command)
 static void
 alias_usage_error (void)
 {
-  error (_("Usage: alias [-a] [--] ALIAS = COMMAND"));
+  error (_("Usage: alias [-a] [--] ALIAS = COMMAND [DEFAULT-ARGS...]"));
 }
 
 /* Make an alias of an existing command.  */
@@ -1642,8 +1849,13 @@ alias_usage_error (void)
 static void
 alias_command (const char *args, int from_tty)
 {
+  alias_opts a_opts;
+
+  auto grp = make_alias_options_def_group (&a_opts);
+  gdb::option::process_options
+    (&args, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_ERROR, grp);
+
   int i, alias_argc, command_argc;
-  int abbrev_flag = 0;
   const char *equals;
   const char *alias, *command;
 
@@ -1654,24 +1866,18 @@ alias_command (const char *args, int from_tty)
   std::string args2 (args, equals - args);
 
   gdb_argv built_alias_argv (args2.c_str ());
-  gdb_argv command_argv (equals + 1);
+
+  const char *default_args = equals + 1;
+  struct cmd_list_element *c_command_prefix;
+
+  lookup_cmd_for_default_args (&default_args, &c_command_prefix);
+  std::string command_argv_str (equals + 1,
+				default_args == nullptr
+				? strlen (equals + 1)
+				: default_args - equals - 1);
+  gdb_argv command_argv (command_argv_str.c_str ());
 
   char **alias_argv = built_alias_argv.get ();
-  while (alias_argv[0] != NULL)
-    {
-      if (strcmp (alias_argv[0], "-a") == 0)
-	{
-	  ++alias_argv;
-	  abbrev_flag = 1;
-	}
-      else if (strcmp (alias_argv[0], "--") == 0)
-	{
-	  ++alias_argv;
-	  break;
-	}
-      else
-	break;
-    }
 
   if (alias_argv[0] == NULL || command_argv[0] == NULL
       || *alias_argv[0] == '\0' || *command_argv[0] == '\0')
@@ -1706,6 +1912,8 @@ alias_command (const char *args, int from_tty)
   if (valid_command_p (alias))
     error (_("Alias already exists: %s"), alias);
 
+  struct cmd_list_element *alias_cmd;
+
   /* If ALIAS is one word, it is an alias for the entire COMMAND.
      Example: alias spe = set print elements
 
@@ -1718,8 +1926,8 @@ alias_command (const char *args, int from_tty)
   if (alias_argc == 1)
     {
       /* add_cmd requires *we* allocate space for name, hence the xstrdup.  */
-      add_com_alias (xstrdup (alias_argv[0]), command, class_alias,
-		     abbrev_flag);
+      alias_cmd = add_com_alias (xstrdup (alias_argv[0]), command, class_alias,
+				 a_opts.abbrev_flag);
     }
   else
     {
@@ -1739,19 +1947,30 @@ alias_command (const char *args, int from_tty)
       alias_prefix = alias_prefix_string.c_str ();
       command_prefix = command_prefix_string.c_str ();
 
-      c_command = lookup_cmd_1 (& command_prefix, cmdlist, NULL, 1);
+      c_command = lookup_cmd_1 (& command_prefix, cmdlist, NULL, NULL, 1);
       /* We've already tried to look up COMMAND.  */
       gdb_assert (c_command != NULL
 		  && c_command != (struct cmd_list_element *) -1);
       gdb_assert (c_command->prefixlist != NULL);
-      c_alias = lookup_cmd_1 (& alias_prefix, cmdlist, NULL, 1);
+      c_alias = lookup_cmd_1 (& alias_prefix, cmdlist, NULL, NULL, 1);
       if (c_alias != c_command)
 	error (_("ALIAS and COMMAND prefixes do not match."));
 
       /* add_cmd requires *we* allocate space for name, hence the xstrdup.  */
-      add_alias_cmd (xstrdup (alias_argv[alias_argc - 1]),
-		     command_argv[command_argc - 1],
-		     class_alias, abbrev_flag, c_command->prefixlist);
+      alias_cmd = add_alias_cmd (xstrdup (alias_argv[alias_argc - 1]),
+				 command_argv[command_argc - 1],
+				 class_alias, a_opts.abbrev_flag,
+				 c_command->prefixlist);
+    }
+
+  gdb_assert (alias_cmd);
+  gdb_assert (alias_cmd->default_args == nullptr);
+  if (default_args != nullptr)
+    {
+      default_args = skip_spaces (default_args);
+
+      if (*default_args != '\0')
+	alias_cmd->default_args = xstrdup (default_args);
     }
 }
 
@@ -1940,7 +2159,7 @@ setting_cmd (const char *fnname, struct cmd_list_element *showlist,
     error (_("First argument of %s must be a string."), fnname);
 
   const char *a0 = (const char *) value_contents (argv[0]);
-  cmd_list_element *cmd = lookup_cmd (&a0, showlist, "", -1, 0);
+  cmd_list_element *cmd = lookup_cmd (&a0, showlist, "", NULL, -1, 0);
 
   if (cmd == nullptr || cmd_type (cmd) != show_cmd)
     error (_("First argument of %s must be a "
@@ -2299,6 +2518,26 @@ You can supply a command number to start with, or a `+' to start after\n\
 the previous command number shown."),
 	   &showlist);
 
+  c = add_cmd ("default-args", class_support, set_default_args_command, _("\
+Set or clear default args automatically prepended to a command or alias.\n\
+Usage: set default-args COMMAND [DEFAULT-ARGS...]\n\
+Set or clear the default arguments automatically prepended\n\
+to the arguments the user provides when COMMAND is run.\n\
+Note that COMMAND can be an alias.  Commands and their aliases\n\
+do not share their default arguments, so you can specify different\n\
+default arguments for a command and for each of its aliases.\n\
+Without the [= DEFAULT-ARGS...], clears COMMAND default arguments."),
+	   &setlist);
+  set_cmd_completer_handle_brkchars (c, default_args_cmd_completer);
+
+  c = add_cmd ("default-args", class_support, show_default_args_command, _("\
+Show the default args of a command, or of all commands.\n\
+Usage: show default-args [COMMAND]\n\
+Show the default args of COMMAND.  Without COMMAND, show the default args\n\
+of all commands."),
+	   &showlist);
+  set_cmd_completer_handle_brkchars (c, default_args_cmd_completer);
+
   add_cmd ("version", no_set_class, show_version,
 	   _("Show what version of GDB this is."), &showlist);
 
@@ -2450,19 +2689,37 @@ When 'on', each command is displayed as it is executed."),
 			   NULL,
 			   &setlist, &showlist);
 
-  c = add_com ("alias", class_support, alias_command, _("\
+  const auto alias_opts = make_alias_options_def_group (nullptr);
+
+  static std::string alias_help
+    = gdb::option::build_help (_("\
 Define a new command that is an alias of an existing command.\n\
-Usage: alias [-a] [--] ALIAS = COMMAND\n\
+Usage: alias [-a] [--] ALIAS = COMMAND [DEFAULT-ARGS...]\n\
 ALIAS is the name of the alias command to create.\n\
 COMMAND is the command being aliased to.\n\
-If \"-a\" is specified, the command is an abbreviation,\n\
-and will not appear in help command list output.\n\
+\n\
+Options:\n\
+%OPTIONS%\n\
+You can optionally provide DEFAULT-ARGS to define at the same time\n\
+ALIAS and its default args.  This is the equivalent of:\n\
+  alias ALIAS = COMMAND\n\
+  set default-args ALIAS DEFAULT-ARGS...\n\
 \n\
 Examples:\n\
 Make \"spe\" an alias of \"set print elements\":\n\
-  alias spe = set print elements\n\
+  alias spe set print elements\n\
 Make \"elms\" an alias of \"elements\" in the \"set print\" command:\n\
-  alias -a set print elms = set print elements"));
+  alias -a set print elms set print elements\n\
+Make \"btf\" an alias of \"backtrace -full -past-entry -past-main\" :\n\
+  alias btf = backtrace -full -past-entry -past-main\n\
+Make \"wLapPeu\" an alias of 2 nested \"with\":\n\
+  alias wLapPeu = with language pascal -- with print elements unlimited --"),
+			       alias_opts);
+
+  c = add_com ("alias", class_support, alias_command,
+	       alias_help.c_str ());
+
+  set_cmd_completer_handle_brkchars (c, alias_command_completer);
 
   const char *source_help_text = xstrprintf (_("\
 Read commands from a file named FILE.\n\
diff --git a/gdb/cli/cli-decode.c b/gdb/cli/cli-decode.c
index 7aecd9897e..8cfff843d2 100644
--- a/gdb/cli/cli-decode.c
+++ b/gdb/cli/cli-decode.c
@@ -343,7 +343,7 @@ add_alias_cmd (const char *name, const char *oldname,
   struct cmd_list_element *old;
 
   tmp = oldname;
-  old = lookup_cmd (&tmp, *list, "", 1, 1);
+  old = lookup_cmd (&tmp, *list, "", NULL, 1, 1);
 
   return add_alias_cmd (name, old, theclass, abbrev_flag, list);
 }
@@ -1045,6 +1045,7 @@ void
 help_cmd (const char *command, struct ui_file *stream)
 {
   struct cmd_list_element *c;
+  const char *initial_command = command;
 
   if (!command)
     {
@@ -1058,7 +1059,7 @@ help_cmd (const char *command, struct ui_file *stream)
       return;
     }
 
-  c = lookup_cmd (&command, cmdlist, "", 0, 0);
+  c = lookup_cmd (&command, cmdlist, "", NULL, 0, 0);
 
   if (c == 0)
     return;
@@ -1078,6 +1079,41 @@ help_cmd (const char *command, struct ui_file *stream)
   fputs_filtered (c->doc, stream);
   fputs_filtered ("\n", stream);
 
+  if (c->func != nullptr)
+    {
+      /* Print the default args of the command if it has some.
+	 Use lookup_cmd_composition to find if help was requested for
+	 an alias.  In this case, rather print the alias default_args.  */
+
+      struct cmd_list_element *alias, *prefix_cmd, *cmd;
+      const char *name, *default_args;
+
+      lookup_cmd_composition (initial_command,
+			      &alias, &prefix_cmd, &cmd);
+      gdb_assert (cmd != nullptr);
+      gdb_assert (cmd == c);
+
+      if (alias == nullptr)
+	{
+	  name = c->name;
+	  default_args = c->default_args;
+	}
+      else
+	{
+	  name = alias->name;
+	  default_args = alias->default_args;
+	}
+      if (default_args != nullptr)
+	{
+	  fputs_filtered ("default-args ", stream);
+	  fprintf_styled (stream, title_style.style (),
+			  "%s%s",
+			  prefix_cmd == nullptr ? "" : prefix_cmd->prefixname,
+			  name);
+	  fprintf_filtered (stream, " = %s\n", default_args);
+	}
+    }
+
   if (c->prefixlist == 0 && c->func != NULL)
     return;
   fprintf_filtered (stream, "\n");
@@ -1271,6 +1307,13 @@ print_help_for_command (struct cmd_list_element *c, const char *prefix,
   fputs_filtered (" -- ", stream);
   print_doc_line (stream, c->doc, false);
   fputs_filtered ("\n", stream);
+  if (c->default_args != nullptr)
+    {
+      fputs_filtered ("  default-args ", stream);
+      fprintf_styled (stream, title_style.style (),
+		      "%s%s", prefix, c->name);
+      fprintf_filtered (stream, " = %s\n", c->default_args);
+    }
 
   if (recurse
       && c->prefixlist != 0
@@ -1422,8 +1465,12 @@ valid_user_defined_cmd_name_p (const char *name)
    the list in which there are ambiguous choices (and *TEXT will be set to
    the ambiguous text string).
 
+   if DEFAULT_ARGS is not null and the found command has default args defined,
+   then *DEFAULT_ARGS points at these default args.
+
    If the located command was an abbreviation, this routine returns the base
-   command of the abbreviation.
+   command of the abbreviation.  Note that *DEFAULT_ARGS will point at the
+   default args defined for the alias.
 
    It does no error reporting whatsoever; control will always return
    to the superior routine.
@@ -1450,11 +1497,13 @@ valid_user_defined_cmd_name_p (const char *name)
 
 struct cmd_list_element *
 lookup_cmd_1 (const char **text, struct cmd_list_element *clist,
-	      struct cmd_list_element **result_list, int ignore_help_classes)
+	      struct cmd_list_element **result_list, const char **default_args,
+	      int ignore_help_classes)
 {
   char *command;
   int len, nfound;
   struct cmd_list_element *found, *c;
+  bool found_alias = false;
   const char *line = *text;
 
   while (**text == ' ' || **text == '\t')
@@ -1490,6 +1539,8 @@ lookup_cmd_1 (const char **text, struct cmd_list_element *clist,
 	/* Will be modified in calling routine
 	   if we know what the prefix command is.  */
 	*result_list = 0;
+      if (default_args != NULL)
+	*default_args = nullptr;
       return CMD_LIST_AMBIGUOUS;	/* Ambiguous.  */
     }
 
@@ -1505,22 +1556,30 @@ lookup_cmd_1 (const char **text, struct cmd_list_element *clist,
        are warning about the alias, we may also warn about the command
        itself and we will adjust the appropriate DEPRECATED_WARN_USER
        flags.  */
-      
+
       if (found->deprecated_warn_user)
 	deprecated_cmd_warning (line);
+
+      /* Return the default_args of the alias, not the default_args
+	 of the command it is pointing to.  */
+      if (default_args != NULL)
+	*default_args = found->default_args;
       found = found->cmd_pointer;
+      found_alias = true;
     }
   /* If we found a prefix command, keep looking.  */
 
   if (found->prefixlist)
     {
       c = lookup_cmd_1 (text, *found->prefixlist, result_list,
-			ignore_help_classes);
+			default_args, ignore_help_classes);
       if (!c)
 	{
 	  /* Didn't find anything; this is as far as we got.  */
 	  if (result_list != NULL)
 	    *result_list = clist;
+	  if (!found_alias && default_args != NULL)
+	    *default_args = found->default_args;
 	  return found;
 	}
       else if (c == CMD_LIST_AMBIGUOUS)
@@ -1535,6 +1594,9 @@ lookup_cmd_1 (const char **text, struct cmd_list_element *clist,
 	         at the top of this function to clarify what is
 	         supposed to be going on.  */
 	      *result_list = found;
+	  /* For ambiguous commands, do not return any default_args args.  */
+	  if (default_args != nullptr)
+	    *default_args = nullptr;
 	  return c;
 	}
       else
@@ -1547,6 +1609,8 @@ lookup_cmd_1 (const char **text, struct cmd_list_element *clist,
     {
       if (result_list != NULL)
 	*result_list = clist;
+      if (!found_alias && default_args != NULL)
+	*default_args = found->default_args;
       return found;
     }
 }
@@ -1566,8 +1630,14 @@ undef_cmd_error (const char *cmdtype, const char *q)
 
 /* Look up the contents of *LINE as a command in the command list LIST.
    LIST is a chain of struct cmd_list_element's.
-   If it is found, return the struct cmd_list_element for that command
-   and update *LINE to point after the command name, at the first argument.
+   If it is found, return the struct cmd_list_element for that command,
+   update *LINE to point after the command name, at the first argument
+   and update *DEFAULT_ARGS (if DEFAULT_ARGS is not null) to point at
+   the default args to prepend to the user provided args when running
+   the command.
+   Note that if the found cmd_list_element is found via an alias,
+   the default args of the alias are returned.
+
    If not found, call error if ALLOW_UNKNOWN is zero
    otherwise (or if error returns) return zero.
    Call error if specified command is ambiguous,
@@ -1581,6 +1651,7 @@ undef_cmd_error (const char *cmdtype, const char *q)
 struct cmd_list_element *
 lookup_cmd (const char **line, struct cmd_list_element *list,
 	    const char *cmdtype,
+	    const char **default_args,
 	    int allow_unknown, int ignore_help_classes)
 {
   struct cmd_list_element *last_list = 0;
@@ -1592,7 +1663,7 @@ lookup_cmd (const char **line, struct cmd_list_element *list,
   if (!*line)
     error (_("Lack of needed %scommand"), cmdtype);
 
-  c = lookup_cmd_1 (line, list, &last_list, ignore_help_classes);
+  c = lookup_cmd_1 (line, list, &last_list, default_args, ignore_help_classes);
 
   if (!c)
     {
diff --git a/gdb/cli/cli-decode.h b/gdb/cli/cli-decode.h
index 4f7c7701e4..92bff3b38c 100644
--- a/gdb/cli/cli-decode.h
+++ b/gdb/cli/cli-decode.h
@@ -72,6 +72,8 @@ struct cmd_list_element
 	xfree ((char *) doc);
       if (name_allocated)
 	xfree ((char *) name);
+      if (default_args)
+	xfree ((char *) default_args);
     }
 
     DISABLE_COPY_AND_ASSIGN (cmd_list_element);
@@ -183,6 +185,10 @@ struct cmd_list_element
     /* Hook for another command to be executed after this command.  */
     struct cmd_list_element *hook_post = nullptr;
 
+    /* Default arguments to automatically prepend to the user
+       provided arguments when running this command or alias.  */
+    const char *default_args = nullptr;
+
     /* Nonzero identifies a prefix command.  For them, the address
        of the variable containing the list of subcommands.  */
     struct cmd_list_element **prefixlist = nullptr;
diff --git a/gdb/cli/cli-script.c b/gdb/cli/cli-script.c
index c9d2378906..e912613785 100644
--- a/gdb/cli/cli-script.c
+++ b/gdb/cli/cli-script.c
@@ -974,7 +974,7 @@ process_next_line (const char *p, struct command_line **command,
       /* Resolve command abbreviations (e.g. 'ws' for 'while-stepping').  */
       const char *cmd_name = p;
       struct cmd_list_element *cmd
-	= lookup_cmd_1 (&cmd_name, cmdlist, NULL, 1);
+	= lookup_cmd_1 (&cmd_name, cmdlist, NULL, NULL, 1);
       cmd_name = skip_spaces (cmd_name);
       bool inline_cmd = *cmd_name != '\0';
 
@@ -1331,7 +1331,7 @@ validate_comname (const char **comname)
       std::string prefix (*comname, last_word - 1);
       const char *tem = prefix.c_str ();
 
-      c = lookup_cmd (&tem, cmdlist, "", 0, 1);
+      c = lookup_cmd (&tem, cmdlist, "", NULL, 0, 1);
       if (c->prefixlist == NULL)
 	error (_("\"%s\" is not a prefix command."), prefix.c_str ());
 
@@ -1387,7 +1387,7 @@ do_define_command (const char *comname, int from_tty,
 
   /* Look it up, and verify that we got an exact match.  */
   tem = comname;
-  c = lookup_cmd (&tem, *list, "", -1, 1);
+  c = lookup_cmd (&tem, *list, "", NULL, -1, 1);
   if (c && strcmp (comname, c->name) != 0)
     c = 0;
 
@@ -1432,7 +1432,7 @@ do_define_command (const char *comname, int from_tty,
     {
       /* Look up cmd it hooks, and verify that we got an exact match.  */
       tem = comname + hook_name_size;
-      hookc = lookup_cmd (&tem, *list, "", -1, 0);
+      hookc = lookup_cmd (&tem, *list, "", NULL, -1, 0);
       if (hookc && strcmp (comname + hook_name_size, hookc->name) != 0)
 	hookc = 0;
       if (!hookc && commands == nullptr)
@@ -1518,7 +1518,7 @@ document_command (const char *comname, int from_tty)
   list = validate_comname (&comname);
 
   tem = comname;
-  c = lookup_cmd (&tem, *list, "", 0, 1);
+  c = lookup_cmd (&tem, *list, "", NULL, 0, 1);
 
   if (c->theclass != class_user)
     error (_("Command \"%s\" is built-in."), comfull);
@@ -1567,7 +1567,7 @@ define_prefix_command (const char *comname, int from_tty)
 
   /* Look it up, and verify that we got an exact match.  */
   tem = comname;
-  c = lookup_cmd (&tem, *list, "", -1, 1);
+  c = lookup_cmd (&tem, *list, "", NULL, -1, 1);
   if (c != nullptr && strcmp (comname, c->name) != 0)
     c = nullptr;
 
diff --git a/gdb/command.h b/gdb/command.h
index 7f436c72c9..cb28dd94cb 100644
--- a/gdb/command.h
+++ b/gdb/command.h
@@ -252,11 +252,13 @@ extern enum cmd_types cmd_type (struct cmd_list_element *cmd);
 extern struct cmd_list_element *lookup_cmd (const char **,
 					    struct cmd_list_element *,
 					    const char *,
+					    const char **,
 					    int, int);
 
 extern struct cmd_list_element *lookup_cmd_1 (const char **,
 					      struct cmd_list_element *,
 					      struct cmd_list_element **,
+					      const char **,
 					      int);
 
 extern struct cmd_list_element *deprecate_cmd (struct cmd_list_element *,
diff --git a/gdb/completer.c b/gdb/completer.c
index 619fb8a028..5e9b13aa90 100644
--- a/gdb/completer.c
+++ b/gdb/completer.c
@@ -1324,7 +1324,7 @@ complete_line_internal_1 (completion_tracker &tracker,
     }
   else
     {
-      c = lookup_cmd_1 (&p, cmdlist, &result_list, ignore_help_classes);
+      c = lookup_cmd_1 (&p, cmdlist, &result_list, NULL, ignore_help_classes);
     }
 
   /* Move p up to the next interesting thing.  */
diff --git a/gdb/guile/scm-cmd.c b/gdb/guile/scm-cmd.c
index ec1adffa25..8fd2772df4 100644
--- a/gdb/guile/scm-cmd.c
+++ b/gdb/guile/scm-cmd.c
@@ -512,7 +512,7 @@ gdbscm_parse_command_name (const char *name,
   prefix_text[i + 1] = '\0';
 
   prefix_text2 = prefix_text;
-  elt = lookup_cmd_1 (&prefix_text2, *start_list, NULL, 1);
+  elt = lookup_cmd_1 (&prefix_text2, *start_list, NULL, NULL, 1);
   if (elt == NULL || elt == CMD_LIST_AMBIGUOUS)
     {
       msg = xstrprintf (_("could not find command prefix '%s'"), prefix_text);
diff --git a/gdb/guile/scm-param.c b/gdb/guile/scm-param.c
index b72766523a..62e2108740 100644
--- a/gdb/guile/scm-param.c
+++ b/gdb/guile/scm-param.c
@@ -466,13 +466,13 @@ add_setshow_generic (enum var_types param_type, enum command_class cmd_class,
   /* Lookup created parameter, and register Scheme object against the
      parameter context.  Perform this task against both lists.  */
   tmp_name = cmd_name;
-  param = lookup_cmd (&tmp_name, *show_list, "", 0, 1);
+  param = lookup_cmd (&tmp_name, *show_list, "", NULL, 0, 1);
   gdb_assert (param != NULL);
   set_cmd_context (param, self);
   *set_cmd = param;
 
   tmp_name = cmd_name;
-  param = lookup_cmd (&tmp_name, *set_list, "", 0, 1);
+  param = lookup_cmd (&tmp_name, *set_list, "", NULL, 0, 1);
   gdb_assert (param != NULL);
   set_cmd_context (param, self);
   *show_cmd = param;
@@ -969,7 +969,7 @@ pascm_parameter_defined_p (const char *name, struct cmd_list_element *list)
 {
   struct cmd_list_element *c;
 
-  c = lookup_cmd_1 (&name, list, NULL, 1);
+  c = lookup_cmd_1 (&name, list, NULL, NULL, 1);
 
   /* If the name is ambiguous that's ok, it's a new parameter still.  */
   return c != NULL && c != CMD_LIST_AMBIGUOUS;
diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index 62890bde2a..fd754ea7f9 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -3191,7 +3191,7 @@ is restored."),
 				     show_inferior_tty_command,
 				     &setlist, &showlist);
   cmd_name = "inferior-tty";
-  c = lookup_cmd (&cmd_name, setlist, "", -1, 1);
+  c = lookup_cmd (&cmd_name, setlist, "", NULL, -1, 1);
   gdb_assert (c != NULL);
   add_alias_cmd ("tty", c, class_alias, 0, &cmdlist);
 
@@ -3204,7 +3204,7 @@ Follow this command with any number of args, to be passed to the program."),
 				   set_args_command,
 				   show_args_command,
 				   &setlist, &showlist);
-  c = lookup_cmd (&cmd_name, setlist, "", -1, 1);
+  c = lookup_cmd (&cmd_name, setlist, "", NULL, -1, 1);
   gdb_assert (c != NULL);
   set_cmd_completer (c, filename_completer);
 
@@ -3223,7 +3223,7 @@ working directory."),
 				   set_cwd_command,
 				   show_cwd_command,
 				   &setlist, &showlist);
-  c = lookup_cmd (&cmd_name, setlist, "", -1, 1);
+  c = lookup_cmd (&cmd_name, setlist, "", NULL, -1, 1);
   gdb_assert (c != NULL);
   set_cmd_completer (c, filename_completer);
 
diff --git a/gdb/python/py-auto-load.c b/gdb/python/py-auto-load.c
index 2084fc43ff..56db946463 100644
--- a/gdb/python/py-auto-load.c
+++ b/gdb/python/py-auto-load.c
@@ -84,12 +84,12 @@ Show the debugger's behaviour regarding auto-loaded Python scripts, "
 			   NULL, NULL, show_auto_load_python_scripts,
 			   &setlist, &showlist);
   cmd_name = "auto-load-scripts";
-  cmd = lookup_cmd (&cmd_name, setlist, "", -1, 1);
+  cmd = lookup_cmd (&cmd_name, setlist, "", NULL, -1, 1);
   deprecate_cmd (cmd, "set auto-load python-scripts");
 
   /* It is needed because lookup_cmd updates the CMD_NAME pointer.  */
   cmd_name = "auto-load-scripts";
-  cmd = lookup_cmd (&cmd_name, showlist, "", -1, 1);
+  cmd = lookup_cmd (&cmd_name, showlist, "", NULL, -1, 1);
   deprecate_cmd (cmd, "show auto-load python-scripts");
 
   add_cmd ("python-scripts", class_info, info_auto_load_python_scripts,
diff --git a/gdb/python/py-cmd.c b/gdb/python/py-cmd.c
index b822c14004..b8e2c365ee 100644
--- a/gdb/python/py-cmd.c
+++ b/gdb/python/py-cmd.c
@@ -390,7 +390,7 @@ gdbpy_parse_command_name (const char *name,
   std::string prefix_text (name, i + 1);
 
   prefix_text2 = prefix_text.c_str ();
-  elt = lookup_cmd_1 (&prefix_text2, *start_list, NULL, 1);
+  elt = lookup_cmd_1 (&prefix_text2, *start_list, NULL, NULL, 1);
   if (elt == NULL || elt == CMD_LIST_AMBIGUOUS)
     {
       PyErr_Format (PyExc_RuntimeError, _("Could not find command prefix %s."),
diff --git a/gdb/python/py-param.c b/gdb/python/py-param.c
index 7b183cfa55..fb39187b18 100644
--- a/gdb/python/py-param.c
+++ b/gdb/python/py-param.c
@@ -569,12 +569,12 @@ add_setshow_generic (int parmclass, enum command_class cmdclass,
   /* Lookup created parameter, and register Python object against the
      parameter context.  Perform this task against both lists.  */
   tmp_name = cmd_name;
-  param = lookup_cmd (&tmp_name, *show_list, "", 0, 1);
+  param = lookup_cmd (&tmp_name, *show_list, "", NULL, 0, 1);
   if (param)
     set_cmd_context (param, self);
 
   tmp_name = cmd_name;
-  param = lookup_cmd (&tmp_name, *set_list, "", 0, 1);
+  param = lookup_cmd (&tmp_name, *set_list, "", NULL, 0, 1);
   if (param)
     set_cmd_context (param, self);
 }
diff --git a/gdb/remote.c b/gdb/remote.c
index 34a8a08f56..3396a80b87 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -14373,10 +14373,10 @@ If set, a break, instead of a cntrl-c, is sent to the remote target."),
 			   set_remotebreak, show_remotebreak,
 			   &setlist, &showlist);
   cmd_name = "remotebreak";
-  cmd = lookup_cmd (&cmd_name, setlist, "", -1, 1);
+  cmd = lookup_cmd (&cmd_name, setlist, "", NULL, -1, 1);
   deprecate_cmd (cmd, "set remote interrupt-sequence");
   cmd_name = "remotebreak"; /* needed because lookup_cmd updates the pointer */
-  cmd = lookup_cmd (&cmd_name, showlist, "", -1, 1);
+  cmd = lookup_cmd (&cmd_name, showlist, "", NULL, -1, 1);
   deprecate_cmd (cmd, "show remote interrupt-sequence");
 
   add_setshow_enum_cmd ("interrupt-sequence", class_support,
diff --git a/gdb/top.c b/gdb/top.c
index f702af9acd..2042f3d473 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -549,6 +549,11 @@ set_repeat_arguments (const char *args)
   repeat_arguments = args;
 }
 
+/* Flag for whether we want to use the configured default args.
+   Default is yes.  */
+
+static bool enable_default_args_var = true;
+
 /* Execute the line P as a command, in the current user context.
    Pass FROM_TTY as second argument to the defining function.  */
 
@@ -577,6 +582,8 @@ execute_command (const char *p, int from_tty)
     {
       const char *cmd = p;
       const char *arg;
+      const char *default_args;
+      std::string default_args_and_arg;
       int was_sync = current_ui->prompt_state == PROMPT_BLOCKED;
 
       line = p;
@@ -584,15 +591,27 @@ execute_command (const char *p, int from_tty)
       /* If trace-commands is set then this will print this command.  */
       print_command_trace ("%s", p);
 
-      c = lookup_cmd (&cmd, cmdlist, "", 0, 1);
+      c = lookup_cmd (&cmd, cmdlist, "", &default_args, 0, 1);
       p = cmd;
 
       scoped_restore save_repeat_args
 	= make_scoped_restore (&repeat_arguments, nullptr);
       const char *args_pointer = p;
 
-      /* Pass null arg rather than an empty one.  */
-      arg = *p ? p : 0;
+      if (default_args != nullptr && enable_default_args_var)
+	{
+	  if (*p)
+	    default_args_and_arg = std::string (default_args)
+	      + ' ' + std::string (p);
+	  else
+	    default_args_and_arg = std::string (default_args);
+	  arg = default_args_and_arg.c_str ();
+	}
+      else
+	{
+	  /* Pass null arg rather than an empty one.  */
+	  arg = *p ? p : 0;
+	}
 
       /* FIXME: cagney/2002-02-02: The c->type test is pretty dodgy
          while the is_complete_command(cfunc) test is just plain
@@ -1935,7 +1954,7 @@ set_verbose (const char *args, int from_tty, struct cmd_list_element *c)
   const char *cmdname = "verbose";
   struct cmd_list_element *showcmd;
 
-  showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, 1);
+  showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, NULL, 1);
   gdb_assert (showcmd != NULL && showcmd != CMD_LIST_AMBIGUOUS);
 
   if (c->doc && c->doc_allocated)
@@ -2171,6 +2190,19 @@ EMACS-like or VI-like commands like control-P or ESC."),
 			   show_editing,
 			   &setlist, &showlist);
 
+  add_setshow_boolean_cmd ("enable-default-args", class_support,
+			   &enable_default_args_var, _("\
+Set whether GDB prepends default args when running a command.\n\
+The default args for a command are configured using\n\
+\"set default-args COMMAND = DEFAULT-ARGS..."), _("\
+Show whether GDB prepends default args when running a command."), _("\
+Use \"on\" to enable the usage of the configured default args,\n\
+and \"off\" to disable it.\n\
+Without an argument, default args usage is enabled."),
+			   NULL,
+			   NULL,
+			   &setlist, &showlist);
+
   add_setshow_boolean_cmd ("save", no_class, &write_history_p, _("\
 Set saving of the history record on exit."), _("\
 Show saving of the history record on exit."), _("\
diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c
index aa6bea4a8f..26df3e0f61 100644
--- a/gdb/tracepoint.c
+++ b/gdb/tracepoint.c
@@ -651,7 +651,7 @@ validate_actionline (const char *line, struct breakpoint *b)
   if (*p == '#')		/* comment line */
     return;
 
-  c = lookup_cmd (&p, cmdlist, "", -1, 1);
+  c = lookup_cmd (&p, cmdlist, "", NULL, -1, 1);
   if (c == 0)
     error (_("`%s' is not a tracepoint action, or is ambiguous."), p);
 
@@ -1303,7 +1303,7 @@ encode_actions_1 (struct command_line *action,
       action_exp = action->line;
       action_exp = skip_spaces (action_exp);
 
-      cmd = lookup_cmd (&action_exp, cmdlist, "", -1, 1);
+      cmd = lookup_cmd (&action_exp, cmdlist, "", NULL, -1, 1);
       if (cmd == 0)
 	error (_("Bad action list item: %s"), action_exp);
 
@@ -2673,7 +2673,7 @@ trace_dump_actions (struct command_line *action,
       if (*action_exp == '#')	/* comment line */
 	continue;
 
-      cmd = lookup_cmd (&action_exp, cmdlist, "", -1, 1);
+      cmd = lookup_cmd (&action_exp, cmdlist, "", NULL, -1, 1);
       if (cmd == 0)
 	error (_("Bad action list item: %s"), action_exp);
 
