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i'm sure there's some sophisticated method for running a shell script at boot, but here's an easy alternative:

open /etc/crontab in a text editor (you'll need root):

$ sudo vim /etc/crontab

add this line to the bottom: @reboot root /bin/bash /root/init.sh

now, open /root/init.sh and put your shell script there.

a word of warning:

don't use the root user unless you need to. if you don't, create a new user and use it instead:

$ useradd -g users -s /bin/(zsh|bash) username

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