From Fedora Project Wiki

Administration Guide - Additional Information

For additional system administration help/reference look at:

websites:

yum information

username and password guidelines

username and group file(s) information

man pages:

To access man pages open a terminal windows and type man put a space and then the name of the command you want to learn more about and press the [Enter] key. For example: 
man passwd
will bring up the man page for the passwd command.
  • passwd(1) ---Learn more about the file format information for the /etc/passwd file.
  • group(5) ---Learn more about the file format information for the /etc/group file.
  • shadow(5) ---Learn more about the file format information for the /etc/shadow file.
  • useradd(8) ---Learn how to create or update user accounts.
  • userdel(8) ---Learn how to delete user accounts.
  • usermod(8) ---Learn how to modify user accounts.
  • chpasswd(8) ---Learn how to update many users' passwords at one time.
  • chage(1) ---Learn how to change user password aging information.
  • chfn(1) ---Learn how to change a user's GECOS (finger) information.
  • chsh(1) ---Learn how to change a user's login shell.
  • groupadd(8) ---Learn how to create a new group.
  • groupdel(8) ---Learn how to delete a group.
  • groupmod(8) ---Learn how to modify a group.
  • gpasswd(1) ---Learn how to administer the /etc/group and /etc/gshadow files.
  • grpck(1) ---Learn how to verify the integrity of the /etc/group and /etc/gshadow files.
  • chgrp(1) ---Learn how to change group-level ownership.
  • chmod(1) ---Learn how to change file access permissions.
  • chown(1) ---Learn how to change file owner and group.
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