Groundblue
Whether it is to pipe the Tcpdump output to another machine hosting Wireshark or checking which service is listening on which port, Windows cmd has similar commands that are present in Linux. Here is some of the most command used in Linux that have equivalent purpose on Windows:Filtering the...
Fred C (W6BSD)
GIT Logo Git is a distributed version control system supporting non linear workflows, that focuses on speed and data integrity. Version control systems are essential for any form of distributed, collaborative development. Git is developed and maintained by Linus Torval the creator of the Linux...
Fred C (W6BSD)
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 its file size and other limitations. The use of cpio by the RPM Package Manager make cpio an important archiving tool. The archive tool pax(1) is the POSIX...
Fred C (W6BSD)
Everyone knows that filenames and variables can contain spaces, but when it comes to writing a shell script most of the shell developers seem eager to forget that fact and write scripts that do not safely handle filenames containing spaces. I can't count the numbers of time I saw people makeing...
Fred C (W6BSD)
When writing code it's important to make sure all the variables are defined. Using an undefined variable can lead to all sorts of problems. Your program may fail randomly or run commands with unexpected results. Almost all languages raise an error when the program tries to access a variable that...
Fred C (W6BSD)
Wyse WinTerm You can build a highly accurate Stratum-1 NTP Server for less than $100 using an old Wyse WinTerm (see picture), a GPS and a few electronic components. The first thing you must do is replace the flash inside of the Wyse with a new flash with a real operating system. You can use an...
Fred C (W6BSD)
One of the tasks of system administrators is to secure the machines inside of their network. To do so you usually configure access lists on your router to prevent access from the outside. If all the ports are blocked the system administrators won't be able to connect to the port 22 (ssh) to manage...