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# passwd root New password: Re-enter new password: # You must take precautions to protect your root password. Anyone who gains access as the root user will have complete control over your system. The online manual for the passwd command provides detailed recommendations for handling and choosing your password. For example, never store your password in a file on your system, and never choose one based on any accessible information, such as your phone number or date of birth. A basic guideline is to make your password as complex as possible using a phrase of several words with numbers and upper and lower case, yet something you can still remember easily so you never have to write it down. You can access the passwd online manual page with the command: # man passwd
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While you are logged in to a regular user account, it may be necessary for you to log in as the root and become a superuser. Ordinarily, you would have to log out of your user account first, and then log in to the root. Instead, you can use the su command (switch user) to log in directly to the root while remaining logged in to your user account. If you are using a GUI desktop like Gnome, you can enter the su command from a terminal window, or use ALT-CTRL-F1 to switch to a command line interface (ALT-CTRL-F10 returns you back to the GUI interface). A CTRL-D or exit command returns you to your own user login. When you are logged in as the root, you can use su to log in as any user, without providing the password. In the next example, the user is logged in already. The su command then logs in as the root user, making the user a superuser. Some basic superuser commands are shown in Table 1-1. $ pwd /home/chris
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$su password: # cd # pwd /root # exit $
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For security reasons, Linux distributions do not allow the use of su in a telnet session to access the root user. For SSH and Kerberos enabled systems, Red Hat provides secure login access using slogin (SSH) and rlogin (Kerberos version).
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Command
su root
Description
Logs a superuser into the root from a user login; the superuser returns to the original login with a CTRL-D. Sets a new password for the login name. With file-name as an argument, installs crontab entries in the file to a crontab file; these entries are operations executed at specified times (see later section): -e Edits the crontab file -l Lists the contents of the crontab file -r Deletes the crontab file Changes the system runlevels. Shuts down the system. Sets the date and time for the system. GUI tool to set system time and date (System Settings | Date & Time). KDE GUI interface cron management tool (System Tools | Task Scheduler).
passwd login-name crontab options file-name
telinit runlevel shutdown options time date Red Hat Date and Time Properties tool, redhat-config-date Kcron
Table 1-1.
Basic System Administration tools
Basic System Administration
Command
redhat-config-rootpassword
Description
GUI tool to change the root user (administrator) password. (System Settings | Root Password). GUI tool to view system logs the root user. (System Settings | Root Password).
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redhat-logviewer
Table 1-1.
Basic System Administration tools (continued)
System Time and Date
You can set the system time and date, using the shell date command or the Red Hat GUI tool redhat-config-date. You probably set the time and date when you first installed your 1 system. You should not need to do so again. If you entered the time incorrectly or moved to a different time zone, 1 though, you could use this utility to change your time.
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