What it says on the tin; I have a Bash script (this is an excerpt) that calls a Bash script inside a container:

echo "Step a1"
docker exec wbdocker-wikibase-1 //bin//bash -c "bash /var/www/html/wbdocker_internal_wrapper.sh"
echo "Step a2"

The Bash script called (wbdocker_internal_wrapper.sh) begins with:

echo "step1"
apt-get -y update
echo "step2"

What should print is:

Step a1
step1
step2
Step a2

But instead what prints is:

Step a1
step1
Step a2

And step2 never prints. Is there any way to prevent moving to “Step a2” until the entirety of wbdocker_internal_wrapper.sh is finished?