home *** CD-ROM | disk | FTP | other *** search
-
-
-
- hhhhiiiissssttttoooorrrryyyy((((nnnn)))) TTTTccccllll (((( )))) hhhhiiiissssttttoooorrrryyyy((((nnnn))))
-
-
-
- _________________________________________________________________
-
- NNNNAAAAMMMMEEEE
- history - Manipulate the history list
-
- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- hhhhiiiissssttttoooorrrryyyy ?_o_p_t_i_o_n? ?_a_r_g _a_r_g ...?
- _________________________________________________________________
-
-
- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- The hhhhiiiissssttttoooorrrryyyy command performs one of several operations
- related to recently-executed commands recorded in a history
- list. Each of these recorded commands is referred to as an
- ``event''. When specifying an event to the hhhhiiiissssttttoooorrrryyyy command,
- the following forms may be used:
-
- [1] A number: if positive, it refers to the event with
- that number (all events are numbered starting at 1).
- If the number is negative, it selects an event relative
- to the current event (----1111 refers to the previous event,
- ----2222 to the one before that, and so on).
-
- [2] A string: selects the most recent event that matches
- the string. An event is considered to match the string
- either if the string is the same as the first
- characters of the event, or if the string matches the
- event in the sense of the ssssttttrrrriiiinnnngggg mmmmaaaattttcccchhhh command.
-
- The hhhhiiiissssttttoooorrrryyyy command can take any of the following forms:
-
- hhhhiiiissssttttoooorrrryyyy
- Same as hhhhiiiissssttttoooorrrryyyy iiiinnnnffffoooo, described below.
-
- hhhhiiiissssttttoooorrrryyyy aaaadddddddd _c_o_m_m_a_n_d ?eeeexxxxeeeecccc?
- Adds the _c_o_m_m_a_n_d argument to the history list as a new
- event. If eeeexxxxeeeecccc is specified (or abbreviated) then the
- command is also executed and its result is returned.
- If eeeexxxxeeeecccc isn't specified then an empty string is
- returned as result.
-
- hhhhiiiissssttttoooorrrryyyy cccchhhhaaaannnnggggeeee _n_e_w_V_a_l_u_e ?_e_v_e_n_t?
- Replaces the value recorded for an event with _n_e_w_V_a_l_u_e.
- _E_v_e_n_t specifies the event to replace, and defaults to
- the _c_u_r_r_e_n_t event (not event ----1111). This command is
- intended for use in commands that implement new forms
- of history substitution and wish to replace the current
- event (which invokes the substitution) with the command
- created through substitution. The return value is an
- empty string.
-
- hhhhiiiissssttttoooorrrryyyy eeeevvvveeeennnntttt ?_e_v_e_n_t?
-
-
-
- Page 1 (printed 7/17/95)
-
-
-
-
-
-
- hhhhiiiissssttttoooorrrryyyy((((nnnn)))) TTTTccccllll (((( )))) hhhhiiiissssttttoooorrrryyyy((((nnnn))))
-
-
-
- Returns the value of the event given by _e_v_e_n_t. _E_v_e_n_t
- defaults to ----1111. This command causes history revision
- to occur: see below for details.
-
- hhhhiiiissssttttoooorrrryyyy iiiinnnnffffoooo ?_c_o_u_n_t?
- Returns a formatted string (intended for humans to
- read) giving the event number and contents for each of
- the events in the history list except the current
- event. If _c_o_u_n_t is specified then only the most recent
- _c_o_u_n_t events are returned.
-
- hhhhiiiissssttttoooorrrryyyy kkkkeeeeeeeepppp _c_o_u_n_t
- This command may be used to change the size of the
- history list to _c_o_u_n_t events. Initially, 20 events are
- retained in the history list. This command returns an
- empty string.
-
- hhhhiiiissssttttoooorrrryyyy nnnneeeexxxxttttiiiidddd
- Returns the number of the next event to be recorded in
- the history list. It is useful for things like
- printing the event number in command-line prompts.
-
- hhhhiiiissssttttoooorrrryyyy rrrreeeeddddoooo ?_e_v_e_n_t?
- Re-executes the command indicated by _e_v_e_n_t and return
- its result. _E_v_e_n_t defaults to ----1111. This command
- results in history revision: see below for details.
-
- hhhhiiiissssttttoooorrrryyyy ssssuuuubbbbssssttttiiiittttuuuutttteeee _o_l_d _n_e_w ?_e_v_e_n_t?
- Retrieves the command given by _e_v_e_n_t (----1111 by default),
- replace any occurrences of _o_l_d by _n_e_w in the command
- (only simple character equality is supported; no wild
- cards), execute the resulting command, and return the
- result of that execution. This command results in
- history revision: see below for details.
-
- hhhhiiiissssttttoooorrrryyyy wwwwoooorrrrddddssss _s_e_l_e_c_t_o_r ?_e_v_e_n_t?
- Retrieves from the command given by _e_v_e_n_t (----1111 by
- default) the words given by _s_e_l_e_c_t_o_r, and return those
- words in a string separated by spaces. The sssseeeelllleeeeccccttttoooorrrr
- argument has three forms. If it is a single number
- then it selects the word given by that number (0000 for
- the command name, 1111 for its first argument, and so on).
- If it consists of two numbers separated by a dash, then
- it selects all the arguments between those two.
- Otherwise sssseeeelllleeeeccccttttoooorrrr is treated as a pattern; all words
- matching that pattern (in the sense of ssssttttrrrriiiinnnngggg mmmmaaaattttcccchhhh)
- are returned. In the numeric forms $$$$ may be used to
- select the last word of a command. For example,
- suppose the most recent command in the history list is
-
- ffffoooorrrrmmmmaaaatttt {{{{%%%%ssss iiiissss %%%%dddd yyyyeeeeaaaarrrrssss oooolllldddd}}}} AAAAlllliiiicccceeee [[[[eeeexxxxpppprrrr $$$$aaaaggggeeeeIIIInnnnMMMMoooonnnntttthhhhssss////11112222]]]]
- Below are some history commands and the results they
-
-
- Page 2 (printed 7/17/95)
-
-
-
-
-
-
- hhhhiiiissssttttoooorrrryyyy((((nnnn)))) TTTTccccllll (((( )))) hhhhiiiissssttttoooorrrryyyy((((nnnn))))
-
-
-
- would produce:
-
-
- hhhhiiiissssttttoooorrrryyyy wwwwoooorrrrddddssss $$$$ [[[[eeeexxxxpppprrrr $$$$aaaaggggeeeeIIIInnnnMMMMoooonnnntttthhhhssss////11112222]]]]
- hhhhiiiissssttttoooorrrryyyy wwwwoooorrrrddddssss 1111----2222{{{{%%%%ssss iiiissss %%%%dddd yyyyeeeeaaaarrrrssss oooolllldddd}}}} AAAAlllliiiicccceeee
- hhhhiiiissssttttoooorrrryyyy wwwwoooorrrrddddssss ****aaaa****oooo****{{{{%%%%ssss iiiissss %%%%dddd yyyyeeeeaaaarrrrssss oooolllldddd}}}} [[[[eeeexxxxpppprrrr $$$$aaaaggggeeeeIIIInnnnMMMMoooonnnntttthhhhssss////11112222]]]]
- HHHHiiiissssttttoooorrrryyyy wwwwoooorrrrddddssss results in history revision: see below
- for details.
-
- HHHHIIIISSSSTTTTOOOORRRRYYYY RRRREEEEVVVVIIIISSSSIIIIOOOONNNN
- The history options eeeevvvveeeennnntttt, rrrreeeeddddoooo, ssssuuuubbbbssssttttiiiittttuuuutttteeee, and wwwwoooorrrrddddssss
- result in ``history revision''. When one of these options
- is invoked then the current event is modified to eliminate
- the history command and replace it with the result of the
- history command. For example, suppose that the most recent
- command in the history list is
-
- sssseeeetttt aaaa [[[[eeeexxxxpppprrrr $$$$bbbb++++2222]]]]
- and suppose that the next command invoked is one of the ones
- on the left side of the table below. The command actually
- recorded in the history event will be the corresponding one
- on the right side of the table.
-
-
- hhhhiiiissssttttoooorrrryyyy rrrreeeeddddoooo sssseeeetttt aaaa [[[[eeeexxxxpppprrrr $$$$bbbb++++2222]]]]
- hhhhiiiissssttttoooorrrryyyy ssss aaaa bbbb sssseeeetttt bbbb [[[[eeeexxxxpppprrrr $$$$bbbb++++2222]]]]
- sssseeeetttt cccc [[[[hhhhiiiissssttttoooorrrryyyy wwww 2222]]]]sssseeeetttt cccc [[[[eeeexxxxpppprrrr $$$$bbbb++++2222]]]]
- History revision is needed because event specifiers like ----1111
- are only valid at a particular time: once more events have
- been added to the history list a different event specifier
- would be needed. History revision occurs even when hhhhiiiissssttttoooorrrryyyy
- is invoked indirectly from the current event (e.g. a user
- types a command that invokes a Tcl procedure that invokes
- hhhhiiiissssttttoooorrrryyyy): the top-level command whose execution eventually
- resulted in a hhhhiiiissssttttoooorrrryyyy command is replaced. If you wish to
- invoke commands like hhhhiiiissssttttoooorrrryyyy wwwwoooorrrrddddssss without history revision,
- you can use hhhhiiiissssttttoooorrrryyyy eeeevvvveeeennnntttt to save the current history event
- and then use hhhhiiiissssttttoooorrrryyyy cccchhhhaaaannnnggggeeee to restore it later.
-
-
- KKKKEEEEYYYYWWWWOOOORRRRDDDDSSSS
- event, history, record, revision
-
-
-
-
-
-
-
-
-
-
- Page 3 (printed 7/17/95)
-
-
-
-