dynamically generate barcode in asp.net c# Note In addition to the history command, you can also use the up/down arrow keys, page up/down in Font

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keys, and Ctrl+p/Ctrl+n to browse the history.
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Listing 2-2. The history Command Shows a List of All Commands That You Recently Used. sander@RNA:~$ history 1 clear 2 dpkg -l "*" | grep ^un 3 aptitude search xen 4 aptitude show xen-source
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CHAPTER 2 GETTING THE MOST OUT OF THE COMMAND LINE
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aptitude show xen-source-2.6.16 exit apt-get install xen sudo apt-get install xen
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This is where the history feature becomes especially useful because you can reissue any command from this list without typing it all over again. If you want to run any of the listed (and numbered) commands again, simply type its number preceded by an exclamation mark. In this example, typing !5 would run aptitude show xen-source-2.6.16 again. A user can also erase his or her history by using the history command. The most important option offered by this Bash internal command is the option -c, which clears the history list for that user. This is especially useful because everything that a user types at the command line such as passwords is recorded. So use history -c to make sure your history is cleared if you d rather not have others knowing what you ve been up to. Once using this option, however, you can t use the arrow up key to access previous commands, because those are all erased. Because everything you enter from the command line is saved, I recommend never typing a plain-text password in the first place, even if you regularly erase the history. The commands that do require you to enter a password will prompt you anyway if you don't enter one right away.
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Managing Bash with Key Sequences
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Sometimes, you ll enter a command from the Bash command line and either nothing happens at all or else something totally unexpected happens. In such an event, it s good to know that some key sequences are available to perform basic Bash management tasks. Here are some of the most useful key sequences. Ctrl+C: Use this key sequence to quit a command that is not responding (or simply takes too long to complete). This key sequence works in most scenarios where the command is operational and producing output to the screen. In general, Ctrl+C is also a good choice if you absolutely don t have a clue as to what s happening and you just want to terminate the command that s running in your shell. If used in the shell itself, it will close the shell as well. Ctrl+D: This key sequence is used to send the end of file (EOF) signal to a command. Use this when the command is waiting for more input, which is indicated by the secondary prompt (>). You can also use this key sequence to close a shell session. Ctrl+R: This is the reversed search feature. It will open the reversed I-search prompt, which helps you locate commands that you used previously. The Ctrl+R key sequence searches the Bash history, and the feature is especially useful when working with longer commands. As before, type the first characters of the command and you will see the last command you ve used that started with the same characters. Ctrl+Z: Some people use Ctrl+Z to stop a command that is running interactively on the console (in the foreground). Although it does stop the command, it does not terminate it. A command that is stopped with Ctrl+Z is merely paused, so that you can easily start it in the background using the bg command or in the foreground again with the fg command. To start the command again, you need to refer to the job number that the program is using. You can see a list of these job numbers using the jobs command.
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Performing Basic File System Management Tasks
On a Linux system such as Ubuntu, everything is treated as a file. Even a device like your hard disk is addressed by pointing to a file. Therefore, working with files is the most important task when administering Linux. In this section, you ll learn the basics of managing a file system. The following subjects are covered: Working with directories Working with files Viewing text files Creating empty files
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