Linux
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Change all entries in DHCP from 0: to 00:
This command have to be performed in the vim editor: :%s/hardware ethernet 0:/hardware ethernet 00:/
Security
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How to restrict users to SFTP only instead of SSH
Sometimes you want to have users, that have access to files on your server, but don’t want them to be able to log in and execute commands on your server.
Security
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How to find out which process is listening upon a port
If you have the Apache webserver running on port 80 that will provide a suitable test candidate. If not you can choose another port you know is in use.
Security
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Monitoring active network connections with tcptrack
There are many common scenarios where keeping track of open network connections is useful. General troubleshooting or fixing specific problems are two obvious cases which spring to mind. The most useful tool I’ve discovered for this purpose is tcptrack.
Linux
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Finding which package contains a file in Debian
There are times when you’re looking for a particular library, or file, which you know is available to Debian/Ubuntu but you cannot find the package which contains it. This is the kind of job that the Debian packages site helped with in the past, but given its current unavailability we’ll look at another approach.