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…
Posts related to Linux
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…
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.…
Ubuntu do-release-upgrade reconnect
Usually I do a release upgrade over the network, using ssh with the command do-release-upgrade For some reasons the connection to the host I'm upgrading dies. No panic. Reconnect to…
Calculate file checksums using openssl
If you need to calculate the checksum of a file on Mac or UNIX simply use openssl: openssl md5 DeleteCookies.zip openssl sha DeleteCookies.zip This command gives you the checksum of…
Backup a system to a remote location using ‘netcat’ and ‘tar’
I use to say "backup is only for wimps". But to be honest, I do backups. And I even store the backup media in a save place. To get the…