Regular Expressions

Basic Syntax To use regular expressions first you need to learn the syntax. This syntax consists in a series of letters, numbers, dots, hyphens and special signs, which we can

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SSH Password-less Login

The below example, describe how to set up SSH password-less automatic login from server A to B with user user. Create Authentication SSH-Keygen Keys on A Create .ssh Directory on

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How to configure iptables

Listing current rules Debian servers do not implement any restrictions by default, but for future reference, check the current iptable rules, use the following command. This will print out a

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