Cenafy For Bash

by Liam Hammett · 2 minute read · #open-source #bash

This is an old post!

This post was written over 2 years ago, so its content may not be completely up-to-date. Please take this into consideration when reading it.

Based on the wonderful Chrome extension of the same name that lets you know who the champ is, this is a version for Bash that lets an unsuspecting victim who left their terminal open know about the champ via the magic of ASCII art (and even some killer singing, if they have the say command like on Mac OS).

You can install it as a command with wget:

wget https://raw.githubusercontent.com/ImLiam/cena.bash/master/cena.bash -O /usr/local/bin/cena

Or with curl:

curl -o /usr/local/bin/cena https://raw.githubusercontent.com/ImLiam/cena.bash/master/cena.bash

When using the command, you can pass it an argument that will determine the chance that John will pop his head up when the command is ran, this defaults to run every time. For example, for a 1 in 100 chance of the command actually doing something, you can run cena 100

Now, to make this show up unexpectedly, you can make this run at some unexpected event, like when the shell is first sourced, by adding it to the user’s ~/.bashrc file (or even their ~/.zshrc or alternatives if that’s what they’re using).

echo 'cena 100' >> ~/.bashrc

That might be a bit too obvious though — most terminal-savvy users would expect such things to be there if they’re aware someone’s messing with them. How about hiding it in Ubuntu’s message-of-the-day?

touch /etc/update-motd.d/98-secret-sauceecho 'cena 100' >> /etc/update-motd.d/98-secret-sauce

Of course, if you’re concerned about this being found out too easily, you may also want to wipe their ~/.bash_history file and take even further steps to hide where it’s being loaded from.

You can find the GitHub repository below.

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Liam Hammett

Full-stack software developer that loves working with PHP, Laravel and Vue.