One of the crucial task one have as an administrator is to make sure that there is no suspicious activity on the system that might compromise security.
Monitoring tasks include evaluating login activity for signs of a security breach, such as multiple failed logins.
To monitor login activity, you can use the following six commands.

who. This command [...]

The following is a list of rules and tips you might find useful in dealing with basic security concerns:

Avoid doing your regular jobs when you are logged in as root. This reduces the risk of getting a cuckoo egg or a virus and protects you from your own mistakes.
If possible, always try to use encrypted [...]

New features and changes in this milestone include:

Improved security features such as: better presentation of website identity and security, malware protection, stricter SSL error pages, anti-virus integration in the download manager, and version checking for insecure plugins.
Improved ease of use through: better password management, easier add-on installation, new download manager with resumable downloading, full page [...]

Cowsay generates an ASCII picture of a cow saying something provided by the user. If run with no arguments, it accepts standard input, word-wraps the message given at about 40 columns, and prints the cow saying the given message on standard output.
There are many many fun thinks you can do this program apart from custom [...]