sysadmin

Walk a Directory in Python

A common task when working with files is to walk through a directory, that is, recursively get every file in every directory starting in some location. The Python 3 os module has several functions useful for working with files and directories. One in particular, os.walk() is useful for recursively going through a directory and getting the contents in a structured way. These examples will show you a couple options for walking a directory recursively.

Get Password in Console with Ruby

In Ruby 2.3, they introduced a getpass method on the IO::console class. There are no dependencies since it part of the standard library, but it's only available in versions higher than 2.3. For older versions, we'll look at an alternative method. The getpass method is similar to gets except it will not echo back what you are typing in. This is good for getting a password without printint it to the screen when you type it in. This will demonstrate how to use the method. See the official documentation for IO::console#getpass for more details. We will also look using $stdin.noecho() to wrap Kernel.gets to get a password.

GPG Tutorial

GnuPG is a cryptography tool that helps you manage public and private keys as well as perform encrypt, decrypt, sign, and verify operations. It is an open-source version of PGP. This tutorial will go over basic key management, encrypting (symmetrically and asymmetrically), decrypting, signing messages, and verifying signatures with GPG.

Create ASCII Art Text Banners in Python

ASCII art has a long history in the hacker culture. If you check out any Phrack article and there is almost guaranteed to be some form of ASCII art in there. In this example we are specifically talking about ASCII art fonts that can be used to make banner text for command-line applications, network services, documentation, web pages, etc.