When transferring VM images between machines with different sector sizes (for example, one machine uses 512-byte sectors and another uses 4096-byte sectors), you may need to edit the partition table of the target device using a tool like . This ensures that the start and end positions align with the actual physical positions on the disk. Additionally, you may need to create a BIOS boot pa... read more

PDF files can be encrypted using command line tools QPDF and PDFtk. These are available for Windows and Linux. Using QPDF Description from QPDF: > This is the QPDF package. QPDF is a command-line tool and C++ library that performs content-preserving transformations on PDF files. It supports linearization, encryption, and numerous other features. It can also b... read more

Here are some examples on how to configure NGINX to conditionally log requests based on certain conditions like remote IP address, URI etc by using the map module and variables. Conditional logging Create a variable using ngx\http\map\_module. This is placed in... read more

Install and create partition Install on a Debian based system apt-get install cryptsetup Install on a Red Hat based system yum install cryptsetup Creating a new LUKS partition cryptsetup -y -v luksFormat /dev/$DEVICE Key management Generate 4096-bit random key file head -c 512 /dev/random > KEYFILE Add a key file to next free key slot. This will prompt for a pass... read more

Tested with Raspberry Pi 3 and 4, but should work on some older models too. For Ethernet connected kiosk machines. Download and install Raspberry Pi OS Download img file and image to micro SD card. - Raspberry Pi OS (32-bit) with desktop, Image with desktop based on Debian Buster. Warning: This is not the distribution with "recomm... read more

For GPG versions 2.x only. List keys List public keys gpg --list-keys List all secret keys gpg --list-secret-keys List public or secret keys, but show subkey fingerprints as well gpg --list-keys --with-subkey-fingerprints gpg --list-secret-keys --with-subkey-fingerprints The key ring location is normally shown on the first line on stdout. Use different key ring Lis... read more

In this example, we'll show how to convert multiple PNG images to a multi page searchable PDF file. We'll use the following command line tools: - ImageMagick for converting PNGs into multi page TIFF and PDF files. - Tesseract OCR, an open source OCR engine. - [PDFtk Free](https://www.pdflabs.com/tools/pdftk-the-pdf-toolkit... read more

Installation Install Debian with . Use MBR and create a single root partition filling the entire disk. Choose minimal with no graphical desktop environment. Only choose standard system utilities. Create the default root user and a separate user with username . Install the following packages as root: apt-get install -y... read more

This method is not suitable for transmitting sensitive data. For such purposes, consider using a public key encryption scheme like PGP or GnuPG. The following procedure is appropriate for generating passwords for online logins and similar applications. Word List Acquisition Begin by preparing a text file with dictionary words. We will download word lists from [Scowl](http://wordlist.aspell.n... read more

For RedHat based OS e.g RHEL or CentOS Install yum -y install yum-utils Check current running kernel version rpm -q kernel Remove old kernels, but leave the 2 latest ones. package-cleanup --oldkernels --count=2 Edit and set: installonly_limit=2 This will delete old kernels automatically but leave the latest two next time you perform a `yum... read more

This article provides a comprehensive guide, or more aptly, a set of personal notes, on how to migrate a WordPress blog from one domain name to another. This process is also applicable when transitioning from one web host to another. Initially, you need to gather some details about your old database: - Database host name (e.g., or ) - Database name - Username -... read more