pcap filter
tcpdump and ngrep are both based on libpcap. Therefore both use the same filter expressions. Here is the manual page of the ⇒pcap filter expression. These filter expressions are also…
Network grep “ngrep” on macOS
Sometimes it is very practical to use grep, to find a specific regular expression in some files. It would also be very practical to have the grep functionality on the…
Delete Applications on a Mac
On a Mac, you basically pull your application, you do not want anymore, into your trash bin. That's it. But there are always some config files left in the ~/Library…
tcpdump TCP/IP packet sniffer
Sometimes you need a powerful sniffer on your system. Every Mac and every Linux system got it. You just have to use it. tcpdump The only thing you have to…
Clear DNS cache on a Mac
Every Mac caches resolved DNS queries. Sometimes you get entries which create problems. To get rid of them you have to options: reboot the machine. This is the bad one.…
Reset MySQL root password
Sometimes you do not remember a password anymore. Like me just before. I cannot remember the root password of the one MySQL database. Well, that is not really a problem.…