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Alternatively, you can use the shutdown command with the -h option. With the -r option, it shuts down the system and then reboots it. In the next example, the system is shut down after five minutes. To shut down the system immediately, you can use +0 or the word now (see 29 for more details).
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# shutdown -h now
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Note Shutting down involves a series of important actions, such as unmounting file systems and shutting down any servers (never simply turn off the computer). You can also reboot your system from the login prompt. Logging out does not shut down the system: it is still running and has control of your machine. To shut down and reboot your system, hold down the CTRL and ALT keys, and then press the DEL key (CTRL-ALT-DEL). You system will go through the standard shutdown procedure and then reboot your computer. At this point it is safe to turn off your computer if you wish, or just let the system restart. When you shut down, you will see several messages as Linux shuts itself down. It is not finished until you see the "System is halted" message. If you are rebooting, Linux will shut down and then reboot your system, at which time you can turn it off if you wish. The following steps include all the startup and shutdown procedures for the command line interface:
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1. Boot your computer. 2. At the boot loader, make sure the "linux" entry is selected and press ENTER. (Or, press ENTER if Linux is your default.) 3. After a few messages, the login prompt appears, and then you can log into the system and use it. 4. When you finish working in an account, you can log out. The login prompt then reappears, and you can log into another account. 5. If you are finished working on Linux and want to shut it down, enter the halt command while still logged into your account (shutdown -r will reboot). 6. At the login prompt, you can also shut down and reboot the system with CTRL-ALTDEL. The system first shuts down and then restarts, at which time you can turn off your computer or just let the system start up again. Once you log into an account, you can enter and execute commands. Logging into your Linux account involves two steps: entering your user name, and then your password. You already know what the login prompt looks like. Type in the login name for your user account. If you make a mistake, you can erase characters with the BACKSPACE key. In the next example, the user enters the user name richlp and is then prompted to enter the password:
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Red hat Linux release 7.2 (Enigma) Kernel 2.4.7-10 on i686 turtle login: richlp Password:
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When you type in your password, it does not appear on the screen. This is to protect your password from being seen by others. If you enter either the login or password incorrectly, the system will respond with the error message "Login incorrect" and will ask for your login name again, starting the login process over. You can then reenter your login name and password. Once you enter your user name and password correctly, you are logged into the system. Your command line prompt is displayed, waiting for you to enter a command. Notice the command line prompt is a dollar sign ($), not a sharp sign (#). The $ is the prompt for regular users, whereas the # is the prompt solely for the root user. In this version of Linux, your prompt is preceded by the hostname and the directory you are in. Both are bounded by a set of brackets.
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