Bash script not navigating to folder, only accepting input when "exit" is typed manually - bash

Question

I have the following bash script I am trying to use so I can speed up updates to my code. For some reason it gets stuck at cd /var/www/myapp/code and only prompts input when I type exit to return to the root user.
#!/bin/bash
# Pulls from remote repo and implements changes
su - rails
cd /var/www/myapp/code
git pull
expect "sername for 'https://bitbucket.org':"
send "myusername"
interact
expect "assword for 'https://username#bitbucket.org':"
send "mypassword"
interact
exit
cd /var/www/myapp/code
RAILS_ENV=production bundle exec rake assets:clobber
RAILS_ENV=production bundle exec rake assets:precompile
nginx -t && sudo nginx -s reload
I tried manually entering cd /var/www/myapp/code but it's still not executing until I type exit.

Answer 1

Well, it's a bit of re-factoring, but a solution is to wrap everything in a single su - (user) -c "bla" call, which will automatically exit the subshell as (user) once the commands are all done.
Syntax:
su - (user) -c "command"
Here's how I'd do it:
Note that we have to break commands up with ';', and escape double-quotes with a '\'.
#!/bin/bash
# Pulls from remote repo and implements changes
su - rails -c "cd /var/www/myapp/code;
git pull;
expect \"sername for 'https://bitbucket.org':\";
send \"myusername\";
interact;
expect \"assword for 'https://bitbucket.org':\";
send \"mypassword\";
interact" # Now that the final command's ran,
# we'll auto - exit the subshell
cd /var/www/myapp/code
RAILS_ENV=production bundle exec rake assets:clobber
RAILS_ENV=production bundle exec rake assets:precompile
nginx -t && sudo nginx -s reload