I want to add two power saving commands to /etc/rc.local file.

This to dissable bluetooth:

 rfkill block bluetooth

And this to reduce screen brightness:

echo 3024 > /sys/class/backlight/intel_backlight/brightness

Separately added to /etc/rc.local they work but not both of them together like this:

#/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

echo 3024 > /sys/class/backlight/intel_backlight/brightness

rfkill block bluetooth

exit 0

How do I add the two commands to get them properly executed at start-up?

Update

It turned out to be a timing issue. I fixed it by delaying the execution of the first command thus:

(sleep 5; echo 3021 > /sys/class/backlight/intel_backlight/brightness)&