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+
+
+
+HISTORY(3) HISTORY(3)
+
+
+NNAAMMEE
+ history - GNU History Library
+
+CCOOPPYYRRIIGGHHTT
+ The GNU History Library is Copyright (C) 1989-2002 by the
+ Free Software Foundation, Inc.
+
+DDEESSCCRRIIPPTTIIOONN
+ Many programs read input from the user a line at a time.
+ The GNU History library is able to keep track of those
+ lines, associate arbitrary data with each line, and uti-
+ lize information from previous lines in composing new
+ ones.
+
+
+HHIISSTTOORRYY EEXXPPAANNSSIIOONN
+ The history library supports a history expansion feature
+ that is identical to the history expansion in bbaasshh.. This
+ section describes what syntax features are available.
+
+ History expansions introduce words from the history list
+ into the input stream, making it easy to repeat commands,
+ insert the arguments to a previous command into the cur-
+ rent input line, or fix errors in previous commands
+ quickly.
+
+ History expansion is usually performed immediately after a
+ complete line is read. It takes place in two parts. The
+ first is to determine which line from the history list to
+ use during substitution. The second is to select portions
+ of that line for inclusion into the current one. The line
+ selected from the history is the _e_v_e_n_t, and the portions
+ of that line that are acted upon are _w_o_r_d_s. Various _m_o_d_i_-
+ _f_i_e_r_s are available to manipulate the selected words. The
+ line is broken into words in the same fashion as bbaasshh does
+ when reading input, so that several words that would oth-
+ erwise be separated are considered one word when sur-
+ rounded by quotes (see the description of hhiissttoorryy__ttookk--
+ eenniizzee(()) below). History expansions are introduced by the
+ appearance of the history expansion character, which is !!
+ by default. Only backslash (\\) and single quotes can
+ quote the history expansion character.
+
+ EEvveenntt DDeessiiggnnaattoorrss
+ An event designator is a reference to a command line entry
+ in the history list.
+
+ !! Start a history substitution, except when followed
+ by a bbllaannkk, newline, = or (.
+ !!_n Refer to command line _n.
+ !!--_n Refer to the current command line minus _n.
+ !!!! Refer to the previous command. This is a synonym
+ for `!-1'.
+
+
+
+
+GNU History 4.3 2002 January 31 1
+
+
+
+
+
+HISTORY(3) HISTORY(3)
+
+
+ !!_s_t_r_i_n_g
+ Refer to the most recent command starting with
+ _s_t_r_i_n_g.
+ !!??_s_t_r_i_n_g[[??]]
+ Refer to the most recent command containing _s_t_r_i_n_g.
+ The trailing ?? may be omitted if _s_t_r_i_n_g is followed
+ immediately by a newline.
+ ^^_s_t_r_i_n_g_1^^_s_t_r_i_n_g_2^^
+ Quick substitution. Repeat the last command,
+ replacing _s_t_r_i_n_g_1 with _s_t_r_i_n_g_2. Equivalent to
+ ``!!:s/_s_t_r_i_n_g_1/_s_t_r_i_n_g_2/'' (see MMooddiiffiieerrss below).
+ !!## The entire command line typed so far.
+
+ WWoorrdd DDeessiiggnnaattoorrss
+ Word designators are used to select desired words from the
+ event. A :: separates the event specification from the
+ word designator. It may be omitted if the word designator
+ begins with a ^^, $$, **, --, or %%. Words are numbered from
+ the beginning of the line, with the first word being
+ denoted by 0 (zero). Words are inserted into the current
+ line separated by single spaces.
+
+ 00 ((zzeerroo))
+ The zeroth word. For the shell, this is the com-
+ mand word.
+ _n The _nth word.
+ ^^ The first argument. That is, word 1.
+ $$ The last argument.
+ %% The word matched by the most recent `?_s_t_r_i_n_g?'
+ search.
+ _x--_y A range of words; `-_y' abbreviates `0-_y'.
+ ** All of the words but the zeroth. This is a synonym
+ for `_1_-_$'. It is not an error to use ** if there is
+ just one word in the event; the empty string is
+ returned in that case.
+ xx** Abbreviates _x_-_$.
+ xx-- Abbreviates _x_-_$ like xx**, but omits the last word.
+
+ If a word designator is supplied without an event specifi-
+ cation, the previous command is used as the event.
+
+ MMooddiiffiieerrss
+ After the optional word designator, there may appear a
+ sequence of one or more of the following modifiers, each
+ preceded by a `:'.
+
+ hh Remove a trailing file name component, leaving only
+ the head.
+ tt Remove all leading file name components, leaving
+ the tail.
+ rr Remove a trailing suffix of the form _._x_x_x, leaving
+ the basename.
+ ee Remove all but the trailing suffix.
+ pp Print the new command but do not execute it.
+
+
+
+GNU History 4.3 2002 January 31 2
+
+
+
+
+
+HISTORY(3) HISTORY(3)
+
+
+ qq Quote the substituted words, escaping further sub-
+ stitutions.
+ xx Quote the substituted words as with qq, but break
+ into words at bbllaannkkss and newlines.
+ ss//_o_l_d//_n_e_w//
+ Substitute _n_e_w for the first occurrence of _o_l_d in
+ the event line. Any delimiter can be used in place
+ of /. The final delimiter is optional if it is the
+ last character of the event line. The delimiter
+ may be quoted in _o_l_d and _n_e_w with a single back-
+ slash. If & appears in _n_e_w, it is replaced by _o_l_d.
+ A single backslash will quote the &. If _o_l_d is
+ null, it is set to the last _o_l_d substituted, or, if
+ no previous history substitutions took place, the
+ last _s_t_r_i_n_g in a !!??_s_t_r_i_n_g[[??]] search.
+ && Repeat the previous substitution.
+ gg Cause changes to be applied over the entire event
+ line. This is used in conjunction with `::ss' (e.g.,
+ `::ggss//_o_l_d//_n_e_w//') or `::&&'. If used with `::ss', any
+ delimiter can be used in place of /, and the final
+ delimiter is optional if it is the last character
+ of the event line.
+
+PPRROOGGRRAAMMMMIINNGG WWIITTHH HHIISSTTOORRYY FFUUNNCCTTIIOONNSS
+ This section describes how to use the History library in
+ other programs.
+
+ IInnttrroodduuccttiioonn ttoo HHiissttoorryy
+ The programmer using the History library has available
+ functions for remembering lines on a history list, associ-
+ ating arbitrary data with a line, removing lines from the
+ list, searching through the list for a line containing an
+ arbitrary text string, and referencing any line in the
+ list directly. In addition, a history _e_x_p_a_n_s_i_o_n function
+ is available which provides for a consistent user inter-
+ face across different programs.
+
+ The user using programs written with the History library
+ has the benefit of a consistent user interface with a set
+ of well-known commands for manipulating the text of previ-
+ ous lines and using that text in new commands. The basic
+ history manipulation commands are identical to the history
+ substitution provided by bbaasshh.
+
+ If the programmer desires, he can use the Readline
+ library, which includes some history manipulation by
+ default, and has the added advantage of command line edit-
+ ing.
+
+ Before declaring any functions using any functionality the
+ History library provides in other code, an application
+ writer should include the file _<_r_e_a_d_l_i_n_e_/_h_i_s_t_o_r_y_._h_> in any
+ file that uses the History library's features. It sup-
+ plies extern declarations for all of the library's public
+
+
+
+GNU History 4.3 2002 January 31 3
+
+
+
+
+
+HISTORY(3) HISTORY(3)
+
+
+ functions and variables, and declares all of the public
+ data structures.
+
+
+ HHiissttoorryy SSttoorraaggee
+ The history list is an array of history entries. A his-
+ tory entry is declared as follows:
+
+ _t_y_p_e_d_e_f _v_o_i_d _* hhiissttddaattaa__tt;;
+
+ typedef struct _hist_entry {
+ char *line;
+ histdata_t data;
+ } HIST_ENTRY;
+
+ The history list itself might therefore be declared as
+
+ _H_I_S_T___E_N_T_R_Y _*_* tthhee__hhiissttoorryy__lliisstt;;
+
+ The state of the History library is encapsulated into a
+ single structure:
+
+ /*
+ * A structure used to pass around the current state of the history.
+ */
+ typedef struct _hist_state {
+ HIST_ENTRY **entries; /* Pointer to the entries themselves. */
+ int offset; /* The location pointer within this array. */
+ int length; /* Number of elements within this array. */
+ int size; /* Number of slots allocated to this array. */
+ int flags;
+ } HISTORY_STATE;
+
+ If the flags member includes HHSS__SSTTIIFFLLEEDD, the history has
+ been stifled.
+
+HHiissttoorryy FFuunnccttiioonnss
+ This section describes the calling sequence for the vari-
+ ous functions exported by the GNU History library.
+
+ IInniittiiaalliizziinngg HHiissttoorryy aanndd SSttaattee MMaannaaggeemmeenntt
+ This section describes functions used to initialize and
+ manage the state of the History library when you want to
+ use the history functions in your program.
+
+ _v_o_i_d uussiinngg__hhiissttoorryy (_v_o_i_d)
+ Begin a session in which the history functions might be
+ used. This initializes the interactive variables.
+
+ _H_I_S_T_O_R_Y___S_T_A_T_E _* hhiissttoorryy__ggeett__hhiissttoorryy__ssttaattee (_v_o_i_d)
+ Return a structure describing the current state of the
+ input history.
+
+ _v_o_i_d hhiissttoorryy__sseett__hhiissttoorryy__ssttaattee (_H_I_S_T_O_R_Y___S_T_A_T_E _*_s_t_a_t_e)
+
+
+
+GNU History 4.3 2002 January 31 4
+
+
+
+
+
+HISTORY(3) HISTORY(3)
+
+
+ Set the state of the history list according to _s_t_a_t_e.
+
+
+ HHiissttoorryy LLiisstt MMaannaaggeemmeenntt
+ These functions manage individual entries on the history
+ list, or set parameters managing the list itself.
+
+ _v_o_i_d aadddd__hhiissttoorryy (_c_o_n_s_t _c_h_a_r _*_s_t_r_i_n_g)
+ Place _s_t_r_i_n_g at the end of the history list. The associ-
+ ated data field (if any) is set to NNUULLLL.
+
+ _H_I_S_T___E_N_T_R_Y _* rreemmoovvee__hhiissttoorryy (_i_n_t _w_h_i_c_h)
+ Remove history entry at offset _w_h_i_c_h from the history.
+ The removed element is returned so you can free the line,
+ data, and containing structure.
+
+ _H_I_S_T___E_N_T_R_Y _* rreeppllaaccee__hhiissttoorryy__eennttrryy (_i_n_t _w_h_i_c_h_, _c_o_n_s_t _c_h_a_r
+ _*_l_i_n_e_, _h_i_s_t_d_a_t_a___t _d_a_t_a)
+ Make the history entry at offset _w_h_i_c_h have _l_i_n_e and _d_a_t_a.
+ This returns the old entry so you can dispose of the data.
+ In the case of an invalid _w_h_i_c_h, a NNUULLLL pointer is
+ returned.
+
+ _v_o_i_d cclleeaarr__hhiissttoorryy (_v_o_i_d)
+ Clear the history list by deleting all the entries.
+
+ _v_o_i_d ssttiiffllee__hhiissttoorryy (_i_n_t _m_a_x)
+ Stifle the history list, remembering only the last _m_a_x
+ entries.
+
+ _i_n_t uunnssttiiffllee__hhiissttoorryy (_v_o_i_d)
+ Stop stifling the history. This returns the previously-
+ set maximum number of history entries (as set by ssttii--
+ ffllee__hhiissttoorryy(())). history was stifled. The value is posi-
+ tive if the history was stifled, negative if it wasn't.
+
+ _i_n_t hhiissttoorryy__iiss__ssttiifflleedd (_v_o_i_d)
+ Returns non-zero if the history is stifled, zero if it is
+ not.
+
+
+ IInnffoorrmmaattiioonn AAbboouutt tthhee HHiissttoorryy LLiisstt
+ These functions return information about the entire his-
+ tory list or individual list entries.
+
+ _H_I_S_T___E_N_T_R_Y _*_* hhiissttoorryy__lliisstt (_v_o_i_d)
+ Return a NNUULLLL terminated array of _H_I_S_T___E_N_T_R_Y _* which is
+ the current input history. Element 0 of this list is the
+ beginning of time. If there is no history, return NNUULLLL.
+
+ _i_n_t wwhheerree__hhiissttoorryy (_v_o_i_d)
+ Returns the offset of the current history element.
+
+ _H_I_S_T___E_N_T_R_Y _* ccuurrrreenntt__hhiissttoorryy (_v_o_i_d)
+
+
+
+GNU History 4.3 2002 January 31 5
+
+
+
+
+
+HISTORY(3) HISTORY(3)
+
+
+ Return the history entry at the current position, as
+ determined by wwhheerree__hhiissttoorryy(()). If there is no entry
+ there, return a NNUULLLL pointer.
+
+ _H_I_S_T___E_N_T_R_Y _* hhiissttoorryy__ggeett (_i_n_t _o_f_f_s_e_t)
+ Return the history entry at position _o_f_f_s_e_t, starting from
+ hhiissttoorryy__bbaassee. If there is no entry there, or if _o_f_f_s_e_t is
+ greater than the history length, return a NNUULLLL pointer.
+
+ _i_n_t hhiissttoorryy__ttoottaall__bbyytteess (_v_o_i_d)
+ Return the number of bytes that the primary history
+ entries are using. This function returns the sum of the
+ lengths of all the lines in the history.
+
+
+ MMoovviinngg AArroouunndd tthhee HHiissttoorryy LLiisstt
+ These functions allow the current index into the history
+ list to be set or changed.
+
+ _i_n_t hhiissttoorryy__sseett__ppooss (_i_n_t _p_o_s)
+ Set the current history offset to _p_o_s, an absolute index
+ into the list. Returns 1 on success, 0 if _p_o_s is less
+ than zero or greater than the number of history entries.
+
+ _H_I_S_T___E_N_T_R_Y _* pprreevviioouuss__hhiissttoorryy (_v_o_i_d)
+ Back up the current history offset to the previous history
+ entry, and return a pointer to that entry. If there is no
+ previous entry, return a NNUULLLL pointer.
+
+ _H_I_S_T___E_N_T_R_Y _* nneexxtt__hhiissttoorryy (_v_o_i_d)
+ Move the current history offset forward to the next his-
+ tory entry, and return the a pointer to that entry. If
+ there is no next entry, return a NNUULLLL pointer.
+
+
+ SSeeaarrcchhiinngg tthhee HHiissttoorryy LLiisstt
+ These functions allow searching of the history list for
+ entries containing a specific string. Searching may be
+ performed both forward and backward from the current his-
+ tory position. The search may be _a_n_c_h_o_r_e_d, meaning that
+ the string must match at the beginning of the history
+ entry.
+
+ _i_n_t hhiissttoorryy__sseeaarrcchh (_c_o_n_s_t _c_h_a_r _*_s_t_r_i_n_g_, _i_n_t _d_i_r_e_c_t_i_o_n)
+ Search the history for _s_t_r_i_n_g, starting at the current
+ history offset. If _d_i_r_e_c_t_i_o_n is less than 0, then the
+ search is through previous entries, otherwise through sub-
+ sequent entries. If _s_t_r_i_n_g is found, then the current
+ history index is set to that history entry, and the value
+ returned is the offset in the line of the entry where
+ _s_t_r_i_n_g was found. Otherwise, nothing is changed, and a -1
+ is returned.
+
+ _i_n_t hhiissttoorryy__sseeaarrcchh__pprreeffiixx (_c_o_n_s_t _c_h_a_r _*_s_t_r_i_n_g_, _i_n_t
+
+
+
+GNU History 4.3 2002 January 31 6
+
+
+
+
+
+HISTORY(3) HISTORY(3)
+
+
+ _d_i_r_e_c_t_i_o_n)
+ Search the history for _s_t_r_i_n_g, starting at the current
+ history offset. The search is anchored: matching lines
+ must begin with _s_t_r_i_n_g. If _d_i_r_e_c_t_i_o_n is less than 0, then
+ the search is through previous entries, otherwise through
+ subsequent entries. If _s_t_r_i_n_g is found, then the current
+ history index is set to that entry, and the return value
+ is 0. Otherwise, nothing is changed, and a -1 is
+ returned.
+
+ _i_n_t hhiissttoorryy__sseeaarrcchh__ppooss (_c_o_n_s_t _c_h_a_r _*_s_t_r_i_n_g_, _i_n_t _d_i_r_e_c_t_i_o_n_,
+ _i_n_t _p_o_s)
+ Search for _s_t_r_i_n_g in the history list, starting at _p_o_s, an
+ absolute index into the list. If _d_i_r_e_c_t_i_o_n is negative,
+ the search proceeds backward from _p_o_s, otherwise forward.
+ Returns the absolute index of the history element where
+ _s_t_r_i_n_g was found, or -1 otherwise.
+
+
+ MMaannaaggiinngg tthhee HHiissttoorryy FFiillee
+ The History library can read the history from and write it
+ to a file. This section documents the functions for man-
+ aging a history file.
+
+ _i_n_t rreeaadd__hhiissttoorryy (_c_o_n_s_t _c_h_a_r _*_f_i_l_e_n_a_m_e)
+ Add the contents of _f_i_l_e_n_a_m_e to the history list, a line
+ at a time. If _f_i_l_e_n_a_m_e is NNUULLLL, then read from _~_/_._h_i_s_-
+ _t_o_r_y. Returns 0 if successful, or eerrrrnnoo if not.
+
+ _i_n_t rreeaadd__hhiissttoorryy__rraannggee (_c_o_n_s_t _c_h_a_r _*_f_i_l_e_n_a_m_e_, _i_n_t _f_r_o_m_,
+ _i_n_t _t_o)
+ Read a range of lines from _f_i_l_e_n_a_m_e, adding them to the
+ history list. Start reading at line _f_r_o_m and end at _t_o.
+ If _f_r_o_m is zero, start at the beginning. If _t_o is less
+ than _f_r_o_m, then read until the end of the file. If _f_i_l_e_-
+ _n_a_m_e is NNUULLLL, then read from _~_/_._h_i_s_t_o_r_y. Returns 0 if
+ successful, or eerrrrnnoo if not.
+
+ _i_n_t wwrriittee__hhiissttoorryy (_c_o_n_s_t _c_h_a_r _*_f_i_l_e_n_a_m_e)
+ Write the current history to _f_i_l_e_n_a_m_e, overwriting _f_i_l_e_-
+ _n_a_m_e if necessary. If _f_i_l_e_n_a_m_e is NNUULLLL, then write the
+ history list to _~_/_._h_i_s_t_o_r_y. Returns 0 on success, or
+ eerrrrnnoo on a read or write error.
+
+
+ _i_n_t aappppeenndd__hhiissttoorryy (_i_n_t _n_e_l_e_m_e_n_t_s_, _c_o_n_s_t _c_h_a_r _*_f_i_l_e_n_a_m_e)
+ Append the last _n_e_l_e_m_e_n_t_s of the history list to _f_i_l_e_n_a_m_e.
+ If _f_i_l_e_n_a_m_e is NNUULLLL, then append to _~_/_._h_i_s_t_o_r_y. Returns 0
+ on success, or eerrrrnnoo on a read or write error.
+
+ _i_n_t hhiissttoorryy__ttrruunnccaattee__ffiillee (_c_o_n_s_t _c_h_a_r _*_f_i_l_e_n_a_m_e_, _i_n_t
+ _n_l_i_n_e_s)
+ Truncate the history file _f_i_l_e_n_a_m_e, leaving only the last
+ _n_l_i_n_e_s lines. If _f_i_l_e_n_a_m_e is NNUULLLL, then _~_/_._h_i_s_t_o_r_y is
+
+
+
+GNU History 4.3 2002 January 31 7
+
+
+
+
+
+HISTORY(3) HISTORY(3)
+
+
+ truncated. Returns 0 on success, or eerrrrnnoo on failure.
+
+
+ HHiissttoorryy EExxppaannssiioonn
+ These functions implement history expansion.
+
+ _i_n_t hhiissttoorryy__eexxppaanndd (_c_h_a_r _*_s_t_r_i_n_g_, _c_h_a_r _*_*_o_u_t_p_u_t)
+ Expand _s_t_r_i_n_g, placing the result into _o_u_t_p_u_t, a pointer
+ to a string. Returns:
+ 0 If no expansions took place (or, if the only
+ change in the text was the removal of escape
+ characters preceding the history expansion
+ character);
+ 1 if expansions did take place;
+ -1 if there was an error in expansion;
+ 2 if the returned line should be displayed,
+ but not executed, as with the ::pp modifier.
+ If an error ocurred in expansion, then _o_u_t_p_u_t contains a
+ descriptive error message.
+
+ _c_h_a_r _* ggeett__hhiissttoorryy__eevveenntt (_c_o_n_s_t _c_h_a_r _*_s_t_r_i_n_g_, _i_n_t _*_c_i_n_d_e_x_,
+ _i_n_t _q_c_h_a_r)
+ Returns the text of the history event beginning at _s_t_r_i_n_g
+ + _*_c_i_n_d_e_x. _*_c_i_n_d_e_x is modified to point to after the
+ event specifier. At function entry, _c_i_n_d_e_x points to the
+ index into _s_t_r_i_n_g where the history event specification
+ begins. _q_c_h_a_r is a character that is allowed to end the
+ event specification in addition to the ``normal'' termi-
+ nating characters.
+
+ _c_h_a_r _*_* hhiissttoorryy__ttookkeenniizzee (_c_o_n_s_t _c_h_a_r _*_s_t_r_i_n_g)
+ Return an array of tokens parsed out of _s_t_r_i_n_g, much as
+ the shell might. The tokens are split on the characters
+ in the hhiissttoorryy__wwoorrdd__ddeelliimmiitteerrss variable, and shell quoting
+ conventions are obeyed.
+
+ _c_h_a_r _* hhiissttoorryy__aarrgg__eexxttrraacctt (_i_n_t _f_i_r_s_t_, _i_n_t _l_a_s_t_, _c_o_n_s_t
+ _c_h_a_r _*_s_t_r_i_n_g)
+ Extract a string segment consisting of the _f_i_r_s_t through
+ _l_a_s_t arguments present in _s_t_r_i_n_g. Arguments are split
+ using hhiissttoorryy__ttookkeenniizzee(()).
+
+
+ HHiissttoorryy VVaarriiaabblleess
+ This section describes the externally-visible variables
+ exported by the GNU History Library.
+
+ _i_n_t hhiissttoorryy__bbaassee
+ The logical offset of the first entry in the history list.
+
+ _i_n_t hhiissttoorryy__lleennggtthh
+ The number of entries currently stored in the history
+ list.
+
+
+
+
+GNU History 4.3 2002 January 31 8
+
+
+
+
+
+HISTORY(3) HISTORY(3)
+
+
+ _i_n_t hhiissttoorryy__mmaaxx__eennttrriieess
+ The maximum number of history entries. This must be
+ changed using ssttiiffllee__hhiissttoorryy(()).
+
+ _c_h_a_r hhiissttoorryy__eexxppaannssiioonn__cchhaarr
+ The character that introduces a history event. The
+ default is !!. Setting this to 0 inhibits history expan-
+ sion.
+
+ _c_h_a_r hhiissttoorryy__ssuubbsstt__cchhaarr
+ The character that invokes word substitution if found at
+ the start of a line. The default is ^^.
+
+ _c_h_a_r hhiissttoorryy__ccoommmmeenntt__cchhaarr
+ During tokenization, if this character is seen as the
+ first character of a word, then it and all subsequent
+ characters up to a newline are ignored, suppressing his-
+ tory expansion for the remainder of the line. This is
+ disabled by default.
+
+ _c_h_a_r _* hhiissttoorryy__wwoorrdd__ddeelliimmiitteerrss
+ The characters that separate tokens for hhiissttoorryy__ttookk--
+ eenniizzee(()). The default value is "" \\tt\\nn(())<<>>;;&&||"".
+
+ _c_h_a_r _* hhiissttoorryy__nnoo__eexxppaanndd__cchhaarrss
+ The list of characters which inhibit history expansion if
+ found immediately following hhiissttoorryy__eexxppaannssiioonn__cchhaarr. The
+ default is space, tab, newline, \\rr, and ==.
+
+ _c_h_a_r _* hhiissttoorryy__sseeaarrcchh__ddeelliimmiitteerr__cchhaarrss
+ The list of additional characters which can delimit a his-
+ tory search string, in addition to space, tab, _: and _? in
+ the case of a substring search. The default is empty.
+
+ _i_n_t hhiissttoorryy__qquuootteess__iinnhhiibbiitt__eexxppaannssiioonn
+ If non-zero, single-quoted words are not scanned for the
+ history expansion character. The default value is 0.
+
+ _r_l___l_i_n_e_b_u_f___f_u_n_c___t _* hhiissttoorryy__iinnhhiibbiitt__eexxppaannssiioonn__ffuunnccttiioonn
+ This should be set to the address of a function that takes
+ two arguments: a cchhaarr ** (_s_t_r_i_n_g) and an iinntt index into
+ that string (_i). It should return a non-zero value if the
+ history expansion starting at _s_t_r_i_n_g_[_i_] should not be per-
+ formed; zero if the expansion should be done. It is
+ intended for use by applications like bbaasshh that use the
+ history expansion character for additional purposes. By
+ default, this variable is set to NNUULLLL.
+
+FFIILLEESS
+ _~_/_._h_i_s_t_o_r_y
+ Default filename for reading and writing saved his-
+ tory
+
+
+
+
+
+GNU History 4.3 2002 January 31 9
+
+
+
+
+
+HISTORY(3) HISTORY(3)
+
+
+SSEEEE AALLSSOO
+ _T_h_e _G_n_u _R_e_a_d_l_i_n_e _L_i_b_r_a_r_y, Brian Fox and Chet Ramey
+ _T_h_e _G_n_u _H_i_s_t_o_r_y _L_i_b_r_a_r_y, Brian Fox and Chet Ramey
+ _b_a_s_h(1)
+ _r_e_a_d_l_i_n_e(3)
+
+AAUUTTHHOORRSS
+ Brian Fox, Free Software Foundation
+ bfox@gnu.org
+
+ Chet Ramey, Case Western Reserve University
+ chet@ins.CWRU.Edu
+
+BBUUGG RREEPPOORRTTSS
+ If you find a bug in the hhiissttoorryy library, you should
+ report it. But first, you should make sure that it really
+ is a bug, and that it appears in the latest version of the
+ hhiissttoorryy library that you have.
+
+ Once you have determined that a bug actually exists, mail
+ a bug report to _b_u_g_-_r_e_a_d_l_i_n_e@_g_n_u_._o_r_g. If you have a fix,
+ you are welcome to mail that as well! Suggestions and
+ `philosophical' bug reports may be mailed to _b_u_g_-_r_e_a_d_-
+ _l_i_n_e@_g_n_u_._o_r_g or posted to the Usenet newsgroup
+ ggnnuu..bbaasshh..bbuugg.
+
+ Comments and bug reports concerning this manual page
+ should be directed to _c_h_e_t_@_i_n_s_._C_W_R_U_._E_d_u.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+GNU History 4.3 2002 January 31 10
+
+