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Users & Groups Management HowTos

Learn all about users and groups on Linux and Unix like operating systems. Topic include user & group creations, permissions & ownership, access control, ACL, and more ( rss feed ).

FreeBSD Change User Password Shell Script

How do I change user password using a shell script under FreeBSD operating systems?
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Linux Display Date And Time Of Login

How do I display user last login date and time under Linux operating systems?
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I'm CentOS Linux version 5.x user and I'd like to restrict execution of /usr/sbin/userhelper to console users only in xusers group?
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Fedora 10 Enable GUI Root Login

Q. How do I enable root login under Fedora 10 Gnome GUI login screen / manager?
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How can I force my Linux users to change their passwords upon the first login under a CentOS / Debian Linux? How do I make sure user must change password at next logon on Linux server?
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Q. How do I create username or user groups in upper case under Linux / *BSD / UNIX operating systems?
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Q. When ever I try to login to my remote Debian Linux server called in013.example.com, I get the following error message in /var/log/auth.log file:

Jul 1 17:04:36 in013 sshd[14447]: Public key 48:de:55:22:xx:yy:zz:yy:xx:yy:zz:yy::88:e8:87:47 blacklisted (see ssh-vulnkey(1))
Jul 1 17:04:36 in013 sshd[14447]: Public key 48:de:55:22:xx:yy:zz:yy:xx:yy:zz:yy::88:e8:87:47 blacklisted (see ssh-vulnkey(1))

I'm using Ubuntu Linux as desktop operating system. How do I fix this error?
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