valyakuttan

Useful pdf tricks on linux systems

1. How to Merge multiple PDF files into one PDF

        $ pdfunite in-1.pdf in-2.pdf in-n.pdf out.pdf

2. How to reduce the file size of a scanned PDF file

$ gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook \

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Configure dnscrypt-proxy as a podman container in Fedora Silverblue

Download dnscrypt-proxy and dnscrypt-proxy.toml

• Pull dnscrypt-proxy docker image from dockerhub

  
  $ sudo podman pull docker.io/klutchell/dnscrypt-proxy
  
  

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Configue tor as a podman container in Fedora Silverblue

Installation

1. Pull image from dockerhub

        $ podman pull docker.io/osminogin/tor-simple

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Run a local HTTP server with Docker 🐳

Serve your static website from localhost using Docker and Nginx.

By @arrested-developer

Why Docker?

Do you know the famous phrase "it works on my machine"?

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Example list of first words to use in a git commit title

I like writing well-formed git commits that explain the intention behind why a code change was made.

Check out Chris Beams excellent How to Write a Git Commit Message if you haven't read it.

Anyway, for a project I've been working on I've gathered up 900+ commits that hold up a pretty high quality (except for one 😁). Let's look at some trends about these commits!

Most common first words in commit titles of a project

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Setting up dnscrypt-proxy on Fedora 38

Installation

1. Install dnscrypt-proxy

        $ sudo dnf install dnscrypt-proxy

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How to remove GRUB from Windows laptop (MS Surface Pro 3) - the 4x BootRec commands did not work

From Windows 11

=====================

1. Run a cmd.exe process with administrator privileges

    cmd.exe

2. Run diskpart

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RMS's gdb Debugger Tutorial

1. How do I use gdb?

When you compile your program, you must tell the compiler to produce a program that is compatible with the debugger. The debugger needs special information to run properly. To do this, you must compile your program with the debugger flag, -g. This step is critical. Without it, the debugger won't have the program symbol information. That means it won't know what your functions and variables are called, and it won't understand when you ask it about them.

How do I...?

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When $a \ne 0$, there are two solutions to $(ax^2 + bx + c = 0)$ and they are $$ x = {-b \pm \sqrt{b^2-4ac} \over 2a} $$

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GnuPG Cheat sheet

Import and Backup secret keys

1. Import secret keys from a backup

   $ gpg --decrypt backup_file.pgp | gpg --import