I've figured out how to control computers remotely and I'll share the script:

Client:

#!/bin/bash
PASSWORD="your_password_here"
sshpass -p "$PASSWORD" scp /dev/stdin user@server:/path/to/cmd.txt <<< "$1"

Server:

#!/bin/bash
while true; do
    while IFS= read -r line; do
        eval "$line"
    done < "cmd.txt"
    > "cmd.txt"
done

Just chmod 777 both files and run as root, ez.