Articles in the SysAdmin category

Unix Archive Tools

The cpio(1) name is derived from CoPy In and Out. Cpio was standardized in POSIX.1-1988, but it was omitted from POSIX.1-2001 because of...

Using free public DNS servers

The DNS is an essential part of the internet, it translates hostnames such as 0x9900.com into IP addresses 149.20.56.139. DNS also plays...

Bash Tip - Beware of spaces

Everyone knows that filenames and variables can contain spaces, but when it comes to writing a shell script most of the shell developers...

Bash Tip - The importance of testing that variables are defined.

When writing code it's important to make sure all the variables are defined. Using an undefined variable can lead to all sorts of...

Using OpenBSD to build a secure access point

At home I have two networks, one for my family and me and one for my guests. Once you are on the family network you can access our...

Build you own stratum-1 NTP server for less than $100

You can build a highly accurate Stratum-1 NTP Server for less than $100 using an old Wyse WinTerm, a GPS and a few electronic components.

Using SSH with an SSH bastion

One of the tasks of system administrators is to secure the machines inside of their network. To do so you usually configure access lists...


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