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# grub.conf generated by anaconda # #boot=/dev/hda default=0 timeout=30 splashimage=(hd0,2)/boot/grub/splash.xpm.gz title Red Hat Linux (2.4.7-10) root (hd0,2) kernel /boot/vmlinuz-2.4.7-10 ro root=/dev/hda3 hdc=ide-scsi initrd /boot/initrd-2.4.7-10.img title Windows XP root (hd0,0) imakeactive chainloader +1
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Linux is designed to serve many users at the same time, as well as provide an interface between the users and the computer with its storage media, such as hard disks and tapes. Users have their own shells through which they interact with the operating system. As a system administrator, you can manage user logins on your system. You can add or remove users, as well as add and remove groups. You also have access to system initialization files you can use to configure all user shells. And you have control over the default initialization files copied into an account when it is first created. With them, you can decide how accounts should initially be configured. Note Every file is owned by a user, even those that are used by services like FTP. In such a case, a special user is created for just that service. For example, for FTP there will be a user named ftp that will own FTP files. You can find out which users are currently logged in with the who command. Add the -u option to display information about each connected user, such as from where they have logged in and how long they have been inactive. The command displays the login name, the login port, the date and time of login, the length of inactivity (if still active), and the process ID for the login shell. For example:
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Any utility to add a user, such as Red Hat User Manager, makes use of certain default files, called configuration files, and directories to set up the new account. A set of path names is used to locate these default files or to know where to create certain user directories. For example, /etc/skel holds initialization files for a new user. /etc/password is the file that holds user passwords. A new user's home directory is placed in the /home directory. Certain files provide added security such as /etc/shadow, which encrypts password entries. A list of the pathnames follows:
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Directory /home /etc/skel
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Description Location of the user's own home directory. Holds the default initialization files for the login shell, such as .bash_profile, .bashrc, and .bash_logout. Includes manu user setup directories and files such as .kde for KDE and Desktop for Gnome. Holds the login shells, such as BASH or TCSH. Holds the password for a user. Holds the group to which the user belongs. Encrypted password file. Encrypted password file for groups. Default login definitions for users.
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The Password Files
When you add a user, an entry for that user is made in the /etc/passwd file, commonly known as the password file. Each entry takes up one line that has several fields separated by colons. The fields are as follows: Field Username Password User ID Group ID Comment Home directory Login shell Description Login name of the user Encrypted password for the user's account Unique number assigned by the system Number used to identify the group to which the user belongs Any user information, such as the user's full name The user's home directory Shell to run when the user logs in; this is the default shell, usually /bin/bash
The following is an example of a /etc/passwd entry. The entry for chris has an * in its Password field, indicating a password has not yet been created for this user. For such entries, you must use passwd to create a password. Notice also, user IDs in this particular system start at 500 and increment by one.
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