9.3 History and Reentering Commands

   

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You have already seen that the shell keeps the history of the commands you type. The history command can be used to list previously used commands. You can use an option to list a particular number of previous commands. To list the three previous commands, you use:

 $  history -3  457     cat /etc/profile 458     more /home/boota/.profile 459     ls -l /etcmore $ 

To list a range of commands, you provide the starting and ending numbers of the commands in the history.

 $  history 451 453  451     date 452     ls 453     mkdir tmp 

To reexecute a previous command, you use the r command with the command number. The r command executes a numbered command from the history and prints the command as well as its result on stdout . In the next example, the command executed is the date command.

 $  r 451  date Wed Oct 13 22:33:17 EDT 1999 $ 

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