history - Manipulate the history list
history ?option? ?arg arg ...?
history(1t) Tcl Built-In Commands history(1t) ______________________________________________________________________________ NAME history - Manipulate the history list SYNOPSIS history ?option? ?arg arg ...? ______________________________________________________________________________ DESCRIPTION The history 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 history command, the following forms may be used:  A number: if positive, it refers to the event with that number (all events are numbered starting at 1). If the number is nega- tive, it selects an event relative to the current event (-1 refers to the previous event, -2 to the one before that, and so on). Event 0 refers to the current event.  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 string match command. The history command can take any of the following forms: history Same as history info, described below. history add command ?exec? Adds the command argument to the history list as a new event. If exec is specified (or abbreviated) then the command is also executed and its result is returned. If exec is not specified then an empty string is returned as result. history change newValue ?event? Replaces the value recorded for an event with newValue. Event specifies the event to replace, and defaults to the current event (not event -1). This command is intended for use in com- mands 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. history clear Erase the history list. The current keep limit is retained. The history event numbers are reset. history event ?event? Returns the value of the event given by event. Event defaults to -1. history info ?count? Returns a formatted string (intended for humans to read) giving the event number and contents for each of the events in the his- tory list except the current event. If count is specified then only the most recent count events are returned. history keep ?count? This command may be used to change the size of the history list to count events. Initially, 20 events are retained in the his- tory list. If count is not specified, the current keep limit is returned. history nextid Returns the number of the next event to be recorded in the his- tory list. It is useful for things like printing the event num- ber in command-line prompts. history redo ?event? Re-executes the command indicated by event and returns its result. Event defaults to -1. This command results in history revision: see below for details. HISTORY REVISION Pre-8.0 Tcl had a complex history revision mechanism. The current mechanism is more limited, and the old history operations substitute and words have been removed. (As a consolation, the clear operation was added.) The history option redo results in much simpler "history revision". When this option is invoked then the most recent event is modified to eliminate the history command and replace it with the result of the history command. If you want to redo an event without modifying his- tory, then use the event operation to retrieve some event, and the add operation to add it to history and execute it. KEYWORDS event, history, record ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | runtime/tcl-8 | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from http://prdownloads.sourceforge.net/tcl/tcl- core8.6.7-src.tar.gz. Further information about this software can be found on the open source community website at https://www.tcl.tk/. Tcl history(1t)