Simple example script to load multiples instances of mega.co.nz client on linux.

load_mega_instances.sh

#!/bin/sh

for d in */ ; do
        HOME=$(pwd)/$d;
        echo $d;
        # Remove the comment by your need 
        # megasync                    # first run (configure client by client at once)
        # megasync 2> /dev/null &     # load all clients at non blocking way

done

The last update of @NicoVarg99's script is already 6 years old. I made a new version with some modifications and checks and I hope you find it useful

MEGAsync Instances (start | stop | status)

# Dependencies:
# sudo apt install zenity libatk-adaptor libgail-common libgtk2.0-0 (or libgtk2.0-0t64 for Ubuntu 24.04)
# Download and Install:
# sudo wget -O /usr/bin/msyncs https://raw.githubusercontent.com/maravento/vault/master/scripts/bash/msyncs
# sudo chmod 755 /usr/bin/msyncs
# Run:
# msyncs start|stop|status

PD: At the moment it is only compatible with Ubuntu 22.04/24.04 x64 (I have not been able to verify it on other distros)