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Category: Bash

Elegant way to pass arguments to a bash script


When I started to write bash scripts, I found that it was really convenient to use the basic way to pass arguments with $1 $2 and so on.

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Reverse shell on firewalled server

Sometimes, it may be useful to keep a connection to a server (let’s call it SERVER_1) that is not reachable from the internet because of iptables ingress rules or simply because it doesn’t have a public IP.  You can reach it from another server (let’s name it SERVER_2) that is accessible.

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Vim – Find and replace strings

Vim can be hard to use at the beginning, but when you’re used to it and know a few tricks, it’s impossible to go back to nano, also known as ‘the text editor for kids’.

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Shell script to add keys to ssh config file

When you have many servers with different usernames, keys etc, it’s easier to manage the server with the .ssh/config file.

A very basic script that I wrote long time ago to easily add an host to my ~/.ssh/config file.

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IP extraction

Regex are useful to cope with basic unix / linux administration tasks.
To extract IP from file, this simple command do the trick :
grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' /var/log/auth.log 15-08-27 - 16:17:00

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