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History Event References !event num !characters ! pattern !-event num
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References a range of events !num-num Note As described in the next section, you can also use the command line editing operations to modify history events-previous commands you have entered.
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In the BASH shell, the history utility keeps a record of the most recent commands you have executed. The commands are numbered starting at 1, and a limit exists to the number of commands remembered-the default is 500. The history utility is a kind of short-term memory, keeping track of the most recent commands you have executed. To see the set of your most recent commands, type history on the command line and press ENTER. A list of your most recent commands is then displayed, preceded by a number.
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$ 1 2 3 4 5 history cp mydata today vi mydata mv mydata reports cd reports ls
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Each of these commands is technically referred to as an "event." An event describes an action that has been taken-a command that has been executed. The events are numbered according to their sequence of execution. The most recent event has the highest number. Each of these events can be identified by its number or beginning characters in the command.
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The history utility enables you to reference a former event, placing it on your command line and enabling you to execute it. The easiest way to do this is to use the UP ARROW and DOWN ARROW keys to place history events on your command line, one at a time. You needn't display the list first with history. Pressing the UP ARROW key once places the last history event on your command line. Pressing it again places the next history event on your command line. Pressing the DOWN ARROW key places the previous event on the command line. The BASH shell also has a history event completion operation invoked by the ESC-TAB command. Much like standard command line completion, you enter part of the history event you want. Then you press ESC, followed by TAB. The event that matches the text you have entered is then located and used to complete your command line entry. Note If more than one history event matches what you have entered, you will hear a beep, and you can then enter more characters to help uniquely identify the event you want. You can edit the event displayed on your command line using the command line editing operations. The LEFT ARROW and RIGHT ARROW keys move you along the command line. You can insert text wherever you stop your cursor. With BACKSPACE and DEL, you can delete characters. Once the event is displayed on your command line, you can press ENTER to execute it. You can also reference and execute history events using the ! history command. The ! is followed by a reference that identifies the command. The reference can be either the number of the event or a beginning set of characters in the event. In the next example, the third command in the history list is referenced first by number and then by the beginning characters:
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$ !3 mv mydata reports $ !mv mv mydata reports
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You can also reference an event using an offset from the end of the list. A negative number will offset from the end of the list to that event, thereby referencing it. In the next example, the fourth command, cd mydata, is referenced using a negative offset, and then executed. Remember that you are offsetting from the end of the list-in this case, event 5, up toward the beginning of the list, event 1. An offset of 4 beginning from event 5 places you at event 2.
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$ !-4 vi mydata
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If no event reference is used, then the last event is assumed. In the next example, the command ! by itself executes the last command the user executed-in this case, ls:
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