This is Info file readline.info, produced by Makeinfo-1.55 from the input file rlman.texinfo. This document describes the GNU Readline Library, a utility which aids in the consistency of user interface across discrete programs that need to provide a command line interface. Copyright (C) 1988, 1991 Free Software Foundation, Inc. Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice pare preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Permission is granted to copy and distribute translations of this manual into another language, under the above conditions for modified versions, except that this permission notice may be stated in a translation approved by the Foundation.  File: readline.info, Node: Modifying Text, Next: Utility Functions, Prev: Redisplay, Up: Readline Convenience Functions Modifying Text -------------- - Function: int rl_insert_text (char *text) Insert TEXT into the line at the current cursor position. - Function: int rl_delete_text (int start, int end) Delete the text between START and END in the current line. - Function: char * rl_copy_text (int start, int end) Return a copy of the text between START and END in the current line. - Function: int rl_kill_text (int start, int end) Copy the text between START and END in the current line to the kill ring, appending or prepending to the last kill if the last command was a kill command. The text is deleted. If START is less than END, the text is appended, otherwise prepended. If the last command was not a kill, a new kill ring slot is used.  File: readline.info, Node: Utility Functions, Prev: Modifying Text, Up: Readline Convenience Functions Utility Functions ----------------- - Function: int rl_reset_terminal (char *terminal_name) Reinitialize Readline's idea of the terminal settings using TERMINAL_NAME as the terminal type (e.g., `vt100'). - Function: int alphabetic (int c) Return 1 if C is an alphabetic character. - Function: int numeric (int c) Return 1 if C is a numeric character. - Function: int ding () Ring the terminal bell, obeying the setting of `bell-style'. The following are implemented as macros, defined in `chartypes.h'. - Function: int uppercase_p (int c) Return 1 if C is an uppercase alphabetic character. - Function: int lowercase_p (int c) Return 1 if C is a lowercase alphabetic character. - Function: int digit_p (int c) Return 1 if C is a numeric character. - Function: int to_upper (int c) If C is a lowercase alphabetic character, return the corresponding uppercase character. - Function: int to_lower (int c) If C is an uppercase alphabetic character, return the corresponding lowercase character. - Function: int digit_value (int c) If C is a number, return the value it represents. An Example ---------- Here is a function which changes lowercase characters to their uppercase equivalents, and uppercase characters to lowercase. If this function was bound to `M-c', then typing `M-c' would change the case of the character under point. Typing `M-1 0 M-c' would change the case of the following 10 characters, leaving the cursor on the last character changed. /* Invert the case of the COUNT following characters. */ int invert_case_line (count, key) int count, key; { register int start, end, i; start = rl_point; if (rl_point >= rl_end) return (0); if (count < 0) { direction = -1; count = -count; } else direction = 1; /* Find the end of the range to modify. */ end = start + (count * direction); /* Force it to be within range. */ if (end > rl_end) end = rl_end; else if (end < 0) end = 0; if (start == end) return (0); if (start > end) { int temp = start; start = end; end = temp; } /* Tell readline that we are modifying the line, so it will save the undo information. */ rl_modifying (start, end); for (i = start; i != end; i++) { if (uppercase_p (rl_line_buffer[i])) rl_line_buffer[i] = to_lower (rl_line_buffer[i]); else if (lowercase_p (rl_line_buffer[i])) rl_line_buffer[i] = to_upper (rl_line_buffer[i]); } /* Move point to on top of the last character changed. */ rl_point = (direction == 1) ? end - 1 : start; return (0); }  File: readline.info, Node: Custom Completers, Prev: Readline Convenience Functions, Up: Programming with GNU Readline Custom Completers ================= Typically, a program that reads commands from the user has a way of disambiguating commands and data. If your program is one of these, then it can provide completion for commands, data, or both. The following sections describe how your program and Readline cooperate to provide this service. * Menu: * How Completing Works:: The logic used to do completion. * Completion Functions:: Functions provided by Readline. * Completion Variables:: Variables which control completion. * A Short Completion Example:: An example of writing completer subroutines.  File: readline.info, Node: How Completing Works, Next: Completion Functions, Up: Custom Completers How Completing Works -------------------- In order to complete some text, the full list of possible completions must be available. That is, it is not possible to accurately expand a partial word without knowing all of the possible words which make sense in that context. The Readline library provides the user interface to completion, and two of the most common completion functions: filename and username. For completing other types of text, you must write your own completion function. This section describes exactly what such functions must do, and provides an example. There are three major functions used to perform completion: 1. The user-interface function `rl_complete ()'. This function is called with the same arguments as other Readline functions intended for interactive use: COUNT and INVOKING_KEY. It isolates the word to be completed and calls `completion_matches ()' to generate a list of possible completions. It then either lists the possible completions, inserts the possible completions, or actually performs the completion, depending on which behavior is desired. 2. The internal function `completion_matches ()' uses your "generator" function to generate the list of possible matches, and then returns the array of these matches. You should place the address of your generator function in `rl_completion_entry_function'. 3. The generator function is called repeatedly from `completion_matches ()', returning a string each time. The arguments to the generator function are TEXT and STATE. TEXT is the partial word to be completed. STATE is zero the first time the function is called, allowing the generator to perform any necessary initialization, and a positive non-zero integer for each subsequent call. When the generator function returns `(char *)NULL' this signals `completion_matches ()' that there are no more possibilities left. Usually the generator function computes the list of possible completions when STATE is zero, and returns them one at a time on subsequent calls. Each string the generator function returns as a match must be allocated with `malloc()'; Readline frees the strings when it has finished with them. - Function: int rl_complete (int ignore, int invoking_key) Complete the word at or before point. You have supplied the function that does the initial simple matching selection algorithm (see `completion_matches ()'). The default is to do filename completion. - Variable: Function * rl_completion_entry_function This is a pointer to the generator function for `completion_matches ()'. If the value of `rl_completion_entry_function' is `(Function *)NULL' then the default filename generator function, `filename_entry_function ()', is used.  File: readline.info, Node: Completion Functions, Next: Completion Variables, Prev: How Completing Works, Up: Custom Completers Completion Functions -------------------- Here is the complete list of callable completion functions present in Readline. - Function: int rl_complete_internal (int what_to_do) Complete the word at or before point. WHAT_TO_DO says what to do with the completion. A value of `?' means list the possible completions. `TAB' means do standard completion. `*' means insert all of the possible completions. `!' means to display all of the possible completions, if there is more than one, as well as performing partial completion. - Function: int rl_complete (int ignore, int invoking_key) Complete the word at or before point. You have supplied the function that does the initial simple matching selection algorithm (see `completion_matches ()' and `rl_completion_entry_function'). The default is to do filename completion. This calls `rl_complete_internal ()' with an argument depending on INVOKING_KEY. - Function: int rl_possible_completions (int count, int invoking_key)) List the possible completions. See description of `rl_complete ()'. This calls `rl_complete_internal ()' with an argument of `?'. - Function: int rl_insert_completions (int count, int invoking_key)) Insert the list of possible completions into the line, deleting the partially-completed word. See description of `rl_complete ()'. This calls `rl_complete_internal ()' with an argument of `*'. - Function: char ** completion_matches (char *text, CPFunction *entry_func) Returns an array of `(char *)' which is a list of completions for TEXT. If there are no completions, returns `(char **)NULL'. The first entry in the returned array is the substitution for TEXT. The remaining entries are the possible completions. The array is terminated with a `NULL' pointer. ENTRY_FUNC is a function of two args, and returns a `(char *)'. The first argument is TEXT. The second is a state argument; it is zero on the first call, and non-zero on subsequent calls. eNTRY_FUNC returns a `NULL' pointer to the caller when there are no more matches. - Function: char * filename_completion_function (char *text, int state) A generator function for filename completion in the general case. Note that completion in Bash is a little different because of all the pathnames that must be followed when looking up completions for a command. The Bash source is a useful reference for writing custom completion functions. - Function: char * username_completion_function (char *text, int state) A completion generator for usernames. TEXT contains a partial username preceded by a random character (usually `~'). As with all completion generators, STATE is zero on the first call and non-zero for subsequent calls.  File: readline.info, Node: Completion Variables, Next: A Short Completion Example, Prev: Completion Functions, Up: Custom Completers Completion Variables -------------------- - Variable: Function * rl_completion_entry_function A pointer to the generator function for `completion_matches ()'. `NULL' means to use `filename_entry_function ()', the default filename completer. - Variable: CPPFunction * rl_attempted_completion_function A pointer to an alternative function to create matches. The function is called with TEXT, START, and END. START and END are indices in `rl_line_buffer' saying what the boundaries of TEXT are. If this function exists and returns `NULL', or if this variable is set to `NULL', then `rl_complete ()' will call the value of `rl_completion_entry_function' to generate matches, otherwise the array of strings returned will be used. - Variable: int rl_completion_query_items Up to this many items will be displayed in response to a possible-completions call. After that, we ask the user if she is sure she wants to see them all. The default value is 100. - Variable: char * rl_basic_word_break_characters The basic list of characters that signal a break between words for the completer routine. The default value of this variable is the characters which break words for completion in Bash, i.e., `" \t\n\"\\'`@$><=;|&{("'. - Variable: char * rl_completer_word_break_characters The list of characters that signal a break between words for `rl_complete_internal ()'. The default list is the value of `rl_basic_word_break_characters'. - Variable: char * rl_special_prefixes The list of characters that are word break characters, but should be left in TEXT when it is passed to the completion function. Programs can use this to help determine what kind of completing to do. For instance, Bash sets this variable to "$@" so that it can complete shell variables and hostnames. - Variable: int rl_ignore_completion_duplicates If non-zero, then disallow duplicates in the matches. Default is 1. - Variable: int rl_filename_completion_desired Non-zero means that the results of the matches are to be treated as filenames. This is *always* zero on entry, and can only be changed within a completion entry generator function. If it is set to a non-zero value, directory names have a slash appended and Readline attempts to quote completed filenames if they contain any embedded word break characters. - Variable: int rl_filename_quoting_desired Non-zero means that the results of the matches are to be quoted using double quotes (or an application-specific quoting mechanism) if the completed filename contains any characters in `rl_completer_word_break_chars'. This is *always* non-zero on entry, and can only be changed within a completion entry generator function. - Variable: Function * rl_ignore_some_completions_function This function, if defined, is called by the completer when real filename completion is done, after all the matching names have been generated. It is passed a `NULL' terminated array of matches. The first element (`matches[0]') is the maximal substring common to all matches. This function can re-arrange the list of matches as required, but each element deleted from the array must be freed. - Variable: char * rl_completer_quote_characters List of characters which can be used to quote a substring of the line. Completion occurs on the entire substring, and within the substring `rl_completer_word_break_characters' are treated as any other character, unless they also appear within this list.  File: readline.info, Node: A Short Completion Example, Prev: Completion Variables, Up: Custom Completers A Short Completion Example -------------------------- Here is a small application demonstrating the use of the GNU Readline library. It is called `fileman', and the source code resides in `examples/fileman.c'. This sample application provides completion of command names, line editing features, and access to the history list. /* fileman.c -- A tiny application which demonstrates how to use the GNU Readline library. This application interactively allows users to manipulate files and their modes. */ #include #include #include #include #include #include #include extern char *getwd (); extern char *xmalloc (); /* The names of functions that actually do the manipulation. */ int com_list (), com_view (), com_rename (), com_stat (), com_pwd (); int com_delete (), com_help (), com_cd (), com_quit (); /* A structure which contains information on the commands this program can understand. */ typedef struct { char *name; /* User printable name of the function. */ Function *func; /* Function to call to do the job. */ char *doc; /* Documentation for this function. */ } COMMAND; COMMAND commands[] = { { "cd", com_cd, "Change to directory DIR" }, { "delete", com_delete, "Delete FILE" }, { "help", com_help, "Display this text" }, { "?", com_help, "Synonym for `help'" }, { "list", com_list, "List files in DIR" }, { "ls", com_list, "Synonym for `list'" }, { "pwd", com_pwd, "Print the current working directory" }, { "quit", com_quit, "Quit using Fileman" }, { "rename", com_rename, "Rename FILE to NEWNAME" }, { "stat", com_stat, "Print out statistics on FILE" }, { "view", com_view, "View the contents of FILE" }, { (char *)NULL, (Function *)NULL, (char *)NULL } }; /* Forward declarations. */ char *stripwhite (); COMMAND *find_command (); /* The name of this program, as taken from argv[0]. */ char *progname; /* When non-zero, this global means the user is done using this program. */ int done; char * dupstr (s) int s; { char *r; r = xmalloc (strlen (s) + 1); strcpy (r, s); return (r); } main (argc, argv) int argc; char **argv; { char *line, *s; progname = argv[0]; initialize_readline (); /* Bind our completer. */ /* Loop reading and executing lines until the user quits. */ for ( ; done == 0; ) { line = readline ("FileMan: "); if (!line) break; /* Remove leading and trailing whitespace from the line. Then, if there is anything left, add it to the history list and execute it. */ s = stripwhite (line); if (*s) { add_history (s); execute_line (s); } free (line); } exit (0); } /* Execute a command line. */ int execute_line (line) char *line; { register int i; COMMAND *command; char *word; /* Isolate the command word. */ i = 0; while (line[i] && whitespace (line[i])) i++; word = line + i; while (line[i] && !whitespace (line[i])) i++; if (line[i]) line[i++] = '\0'; command = find_command (word); if (!command) { fprintf (stderr, "%s: No such command for FileMan.\n", word); return (-1); } /* Get argument to command, if any. */ while (whitespace (line[i])) i++; word = line + i; /* Call the function. */ return ((*(command->func)) (word)); } /* Look up NAME as the name of a command, and return a pointer to that command. Return a NULL pointer if NAME isn't a command name. */ COMMAND * find_command (name) char *name; { register int i; for (i = 0; commands[i].name; i++) if (strcmp (name, commands[i].name) == 0) return (&commands[i]); return ((COMMAND *)NULL); } /* Strip whitespace from the start and end of STRING. Return a pointer into STRING. */ char * stripwhite (string) char *string; { register char *s, *t; for (s = string; whitespace (*s); s++) ; if (*s == 0) return (s); t = s + strlen (s) - 1; while (t > s && whitespace (*t)) t--; *++t = '\0'; return s; } /* **************************************************************** */ /* */ /* Interface to Readline Completion */ /* */ /* **************************************************************** */ char *command_generator (); char **fileman_completion (); /* Tell the GNU Readline library how to complete. We want to try to complete on command names if this is the first word in the line, or on filenames if not. */ initialize_readline () { /* Allow conditional parsing of the ~/.inputrc file. */ rl_readline_name = "FileMan"; /* Tell the completer that we want a crack first. */ rl_attempted_completion_function = (CPPFunction *)fileman_completion; } /* Attempt to complete on the contents of TEXT. START and END show the region of TEXT that contains the word to complete. We can use the entire line in case we want to do some simple parsing. Return the array of matches, or NULL if there aren't any. */ char ** fileman_completion (text, start, end) char *text; int start, end; { char **matches; matches = (char **)NULL; /* If this word is at the start of the line, then it is a command to complete. Otherwise it is the name of a file in the current directory. */ if (start == 0) matches = completion_matches (text, command_generator); return (matches); } /* Generator function for command completion. STATE lets us know whether to start from scratch; without any state (i.e. STATE == 0), then we start at the top of the list. */ char * command_generator (text, state) char *text; int state; { static int list_index, len; char *name; /* If this is a new word to complete, initialize now. This includes saving the length of TEXT for efficiency, and initializing the index variable to 0. */ if (!state) { list_index = 0; len = strlen (text); } /* Return the next name which partially matches from the command list. */ while (name = commands[list_index].name) { list_index++; if (strncmp (name, text, len) == 0) return (dupstr(name)); } /* If no names matched, then return NULL. */ return ((char *)NULL); } /* **************************************************************** */ /* */ /* FileMan Commands */ /* */ /* **************************************************************** */ /* String to pass to system (). This is for the LIST, VIEW and RENAME commands. */ static char syscom[1024]; /* List the file(s) named in arg. */ com_list (arg) char *arg; { if (!arg) arg = ""; sprintf (syscom, "ls -FClg %s", arg); return (system (syscom)); } com_view (arg) char *arg; { if (!valid_argument ("view", arg)) return 1; sprintf (syscom, "more %s", arg); return (system (syscom)); } com_rename (arg) char *arg; { too_dangerous ("rename"); return (1); } com_stat (arg) char *arg; { struct stat finfo; if (!valid_argument ("stat", arg)) return (1); if (stat (arg, &finfo) == -1) { perror (arg); return (1); } printf ("Statistics for `%s':\n", arg); printf ("%s has %d link%s, and is %d byte%s in length.\n", arg, finfo.st_nlink, (finfo.st_nlink == 1) ? "" : "s", finfo.st_size, (finfo.st_size == 1) ? "" : "s"); printf ("Inode Last Change at: %s", ctime (&finfo.st_ctime)); printf (" Last access at: %s", ctime (&finfo.st_atime)); printf (" Last modified at: %s", ctime (&finfo.st_mtime)); return (0); } com_delete (arg) char *arg; { too_dangerous ("delete"); return (1); } /* Print out help for ARG, or for all of the commands if ARG is not present. */ com_help (arg) char *arg; { register int i; int printed = 0; for (i = 0; commands[i].name; i++) { if (!*arg || (strcmp (arg, commands[i].name) == 0)) { printf ("%s\t\t%s.\n", commands[i].name, commands[i].doc); printed++; } } if (!printed) { printf ("No commands match `%s'. Possibilties are:\n", arg); for (i = 0; commands[i].name; i++) { /* Print in six columns. */ if (printed == 6) { printed = 0; printf ("\n"); } printf ("%s\t", commands[i].name); printed++; } if (printed) printf ("\n"); } return (0); } /* Change to the directory ARG. */ com_cd (arg) char *arg; { if (chdir (arg) == -1) { perror (arg); return 1; } com_pwd (""); return (0); } /* Print out the current working directory. */ com_pwd (ignore) char *ignore; { char dir[1024], *s; s = getwd (dir); if (s == 0) { printf ("Error getting pwd: %s\n", dir); return 1; } printf ("Current directory is %s\n", dir); return 0; } /* The user wishes to quit using this program. Just set DONE non-zero. */ com_quit (arg) char *arg; { done = 1; return (0); } /* Function which tells you that you can't do this. */ too_dangerous (caller) char *caller; { fprintf (stderr, "%s: Too dangerous for me to distribute. Write it yourself.\n", caller); } /* Return non-zero if ARG is a valid argument for CALLER, else print an error message and return zero. */ int valid_argument (caller, arg) char *caller, *arg; { if (!arg || !*arg) { fprintf (stderr, "%s: Argument required.\n", caller); return (0); } return (1); }  File: readline.info, Node: Concept Index, Next: Function and Variable Index, Prev: Programming with GNU Readline, Up: Top Concept Index ************* * Menu: * interaction, readline: Readline Interaction. * Kill ring: Readline Killing Commands. * Killing text: Readline Killing Commands. * readline, function: Basic Behavior. * Yanking text: Readline Killing Commands.  File: readline.info, Node: Function and Variable Index, Prev: Concept Index, Up: Top Function and Variable Index *************************** * Menu: * $else: Conditional Init Constructs. * $endif: Conditional Init Constructs. * $if: Conditional Init Constructs. * abort (C-g): Miscellaneous Commands. * accept-line (Newline, Return): Commands For History. * alphabetic: Utility Functions. * backward-char (C-b): Commands For Moving. * backward-delete-char (Rubout): Commands For Text. * backward-kill-line (C-x Rubout): Commands For Killing. * backward-kill-word (M-DEL): Commands For Killing. * backward-word (M-b): Commands For Moving. * beginning-of-history (M-<): Commands For History. * beginning-of-line (C-a): Commands For Moving. * bell-style: Readline Init Syntax. * call-last-kbd-macro (C-x e): Keyboard Macros. * capitalize-word (M-c): Commands For Text. * clear-screen (C-l): Commands For Moving. * comment-begin: Readline Init Syntax. * complete (TAB): Commands For Completion. * completion-query-items: Readline Init Syntax. * completion_matches: Completion Functions. * convert-meta: Readline Init Syntax. * delete-char (C-d): Commands For Text. * delete-horizontal-space (): Commands For Killing. * digit-argument (M-0, M-1, ... M-): Numeric Arguments. * digit_p: Utility Functions. * digit_value: Utility Functions. * ding: Utility Functions. * do-uppercase-version (M-a, M-b, ...): Miscellaneous Commands. * downcase-word (M-l): Commands For Text. * dump-functions (): Miscellaneous Commands. * editing-mode: Readline Init Syntax. * end-kbd-macro (C-x )): Keyboard Macros. * end-of-history (M->): Commands For History. * end-of-line (C-e): Commands For Moving. * expand-tilde: Readline Init Syntax. * filename_completion_function: Completion Functions. * forward-char (C-f): Commands For Moving. * forward-search-history (C-s): Commands For History. * forward-word (M-f): Commands For Moving. * free_undo_list: Allowing Undoing. * history-search-backward (): Commands For History. * history-search-forward (): Commands For History. * horizontal-scroll-mode: Readline Init Syntax. * insert-completions (): Commands For Completion. * keymap: Readline Init Syntax. * kill-line (C-k): Commands For Killing. * kill-whole-line (): Commands For Killing. * kill-word (M-d): Commands For Killing. * lowercase_p: Utility Functions. * mark-modified-lines: Readline Init Syntax. * meta-flag: Readline Init Syntax. * next-history (C-n): Commands For History. * non-incremental-forward-search-history (M-n): Commands For History. * non-incremental-reverse-search-history (M-p): Commands For History. * numeric: Utility Functions. * output-meta: Readline Init Syntax. * possible-completions (M-?): Commands For Completion. * prefix-meta (ESC): Miscellaneous Commands. * previous-history (C-p): Commands For History. * quoted-insert (C-q, C-v): Commands For Text. * re-read-init-file (C-x C-r): Miscellaneous Commands. * readline: Basic Behavior. * redraw-current-line (): Commands For Moving. * reverse-search-history (C-r): Commands For History. * revert-line (M-r): Miscellaneous Commands. * rl_add_defun: Function Naming. * rl_add_undo: Allowing Undoing. * rl_attempted_completion_function: Completion Variables. * rl_basic_word_break_characters: Completion Variables. * rl_begin_undo_group: Allowing Undoing. * rl_bind_key: Binding Keys. * rl_bind_key_in_map: Binding Keys. * rl_clear_message: Redisplay. * rl_complete: How Completing Works. * rl_complete: Completion Functions. * rl_completer_quote_characters: Completion Variables. * rl_completer_word_break_characters: Completion Variables. * rl_complete_internal: Completion Functions. * rl_completion_entry_function: Completion Variables. * rl_completion_entry_function: How Completing Works. * rl_completion_query_items: Completion Variables. * rl_copy_keymap: Keymaps. * rl_copy_text: Modifying Text. * rl_delete_text: Modifying Text. * rl_discard_keymap: Keymaps. * rl_done: Function Writing. * rl_do_undo: Allowing Undoing. * rl_end: Function Writing. * rl_end_undo_group: Allowing Undoing. * rl_filename_completion_desired: Completion Variables. * rl_filename_quoting_desired: Completion Variables. * rl_forced_update_display: Redisplay. * rl_function_of_keyseq: Associating Function Names and Bindings. * rl_generic_bind: Binding Keys. * rl_get_keymap: Keymaps. * rl_get_keymap_by_name: Keymaps. * rl_ignore_completion_duplicates: Completion Variables. * rl_ignore_some_completions_function: Completion Variables. * rl_insert_completions: Completion Functions. * rl_insert_text: Modifying Text. * rl_instream: Function Writing. * rl_invoking_keyseqs: Associating Function Names and Bindings. * rl_invoking_keyseqs_in_map: Associating Function Names and Bindings. * rl_kill_text: Modifying Text. * rl_line_buffer: Function Writing. * rl_make_bare_keymap: Keymaps. * rl_make_keymap: Keymaps. * rl_mark: Function Writing. * rl_message: Redisplay. * rl_modifying: Allowing Undoing. * rl_named_function: Associating Function Names and Bindings. * rl_on_new_line: Redisplay. * rl_outstream: Function Writing. * rl_parse_and_bind: Binding Keys. * rl_pending_input: Function Writing. * rl_point: Function Writing. * rl_possible_completions: Completion Functions. * rl_prompt: Function Writing. * rl_readline_name: Function Writing. * rl_redisplay: Redisplay. * rl_reset_line_state: Redisplay. * rl_reset_terminal: Utility Functions. * rl_set_keymap: Keymaps. * rl_special_prefixes: Completion Variables. * rl_startup_hook: Function Writing. * rl_terminal_name: Function Writing. * rl_unbind_key: Binding Keys. * rl_unbind_key_in_map: Binding Keys. * self-insert (a, b, A, 1, !, ...): Commands For Text. * show-all-if-ambiguous: Readline Init Syntax. * start-kbd-macro (C-x (): Keyboard Macros. * tab-insert (M-TAB): Commands For Text. * tilde-expand (M-~): Miscellaneous Commands. * to_lower: Utility Functions. * to_upper: Utility Functions. * transpose-chars (C-t): Commands For Text. * transpose-words (M-t): Commands For Text. * undo (C-_, C-x C-u): Miscellaneous Commands. * universal-argument (): Numeric Arguments. * unix-line-discard (C-u): Commands For Killing. * unix-word-rubout (C-w): Commands For Killing. * upcase-word (M-u): Commands For Text. * uppercase_p: Utility Functions. * username_completion_function: Completion Functions. * yank (C-y): Commands For Killing. * yank-last-arg (M-., M-_): Commands For History. * yank-nth-arg (M-C-y): Commands For History. * yank-pop (M-y): Commands For Killing.