I built a tiny Linux tool that shouts “FAHH” when I type the wrong command

# I built a tiny Linux tool that shouts “FAHH” when I type the wrong command A few weeks ago I noticed something about the way I work in the terminal. When I’m focused and typing commands fast, I tend to make a lot of small mistakes. Wrong command. Misspelled command. Sometimes I just type something that doesn't exist. And the terminal just replies with the usual: ```bash command not found ``` That message is… boring. And also very easy to ignore. So I started thinking: > What if the terminal could actually **react** when I type something wrong? Not visually. Not with an error popup. But with **sound**. Something dramatic. Something like: **FAHH.** --- ## The idea I wanted something very simple: Whenever I type a command that doesn't exist in the terminal, play a sound. Nothing fancy. Just a tiny reaction that reminds me: > "Hey… that command doesn't exist." I initially looked for something like this inside **VSCode extensions**. There were some interesting ones, but they only worked inside the editor terminal. I wanted something that works everywhere: - WSL - Debian - normal Linux terminals - zsh - bash Basically **anything I run in the shell**. So I decided to build a tiny CLI tool for it. --- ## The result I ended up creating a small tool called: **fahhctl** What it does is very simple. When you type a command that doesn't exist: ```bash fakecommand ``` You still see the normal error message: ```bash command not found: fakecommand ``` But you also hear: **FAHH 🔊** --- ## How it works The tool installs a small hook into your shell configuration. When the shell detects a command that doesn't exist, it simply runs: ```bash fahhctl play ``` Which plays a sound file. That’s it. No background process. No daemon. Just a tiny hook and a sound. --- ## Installation If you're curious and want to try it: ```bash curl -fsSL https://raw.githubusercontent.com/hamza-topo/fahhctl/main/install.sh | bash ``` Then reload your shell: ```bash source ~/.zshrc ``` Now try typing something wrong. --- ## Customize the sound The default sound is a dramatic **FAHH**, but you can replace it with anything. The sound file lives here: ```bash ~/.local/share/fahh/fahh.mp3 ``` So you can replace it with: - a meme sound - a warning beep - a voice saying "wrong command" - whatever you want --- ## Why I actually like this It sounds silly, but it’s surprisingly useful. The sound acts like a **tiny feedback loop**. Instead of silently ignoring mistakes, the terminal gives a quick reaction. It helps me stay a bit more focused when I’m typing commands fast. Also… it's just fun. --- ## The project If you're curious about the code or want to try it: https://github.com/hamza-topo/fahhctl It's a very small project, but it was fun to build. And sometimes the smallest tools are the most satisfying ones.