Advice for everyday Unix systems administration and some clever ways to approach more challenging problems.
The security dudes have been badmouthing telnet for a couple of decades now, reminding us that this old time tool for connecting to remote systems exposes our passwords to the snooping masses. But the telnet command itself still has some handy uses t....
The grep command can search for and list Linux files based on strings you are looking for and add the context of surrounding text.
The /etc/inittab file controls what happens whenever a Unix system is rebooted or forced to change run levels. Let's take a look at the configuration lines that tell your system what it's supposed to do when you hit that power button.
Port knocking is a method of opening ports on a firewall by trying to connect with a series of ports in a pre-determined order. The sequence of “knocks” acts like a secret access code
You can use nmap to quickly, easily and stealthily generate a listing of all systems on a particular subnet. And the process can be even simpler than building your own "ping everybody on this subnet" scripts.
Monitoring your data centers and building access points with CCD cameras can represent a boon to your overall security, but you need to know a little about camera terminology to make the best use of them.
You have probably used lsof from time to time, probably when tracking down some sort of problem. But maybe you haven't tried all of its permutations or looked at it just to get a deeper understanding of how some particular process works. Let....
The svccfg command on Solaris 10 systems allow you to modify the configuration of services. Using it, you can specify how particular services are run in much the same manner you would have made changes in the inetd.conf file on older versions of Sola....
Whenever you use a simple grep command to find a single word or phrase in a file, you run the risk of getting a lot of extra "stuff" you didn't want to see. Here are two grep commands that will do just what you want.
The /etc/acct/holidays file is intended to be used by various accounting utilities on your system that might need to behave differently on certain days of the year -- holidays.
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