Update / collectstatic / loadfixtures automation

Hello, I made a little script for automation for when I update my site on production, it is like:

============ update.sh ============

echo "Connecting"
ssh -t -t prefix.myserver.com -lusername <<END_SCRIPT
echo "Activating the virtual environment..."
source ~/env/bin/activate
echo "Updating project from SVN..."
cd projectname
svn update
#echo "Collecting static files"
#PYTHONPATH=~/env/src/django python manage.py collectstatic
echo "Syncing DB"
PYTHONPATH=~/env/src/django python manage.py syncdb
PYTHONPATH=~/env/src/django python manage.py loaddata people/fixtures/groups.yaml
PYTHONPATH=~/env/src/django python manage.py loaddata people/fixtures/person.yaml
PYTHONPATH=~/env/src/django python manage.py loaddata people/fixtures/sites.yaml
~/init/projectname restart
exit
END_SCRIPT
echo "Done"

============ end update.sh ============

The problem is that, if I uncomment the collectstatic line, it pops the message:
"This will overwrite existing files!
Are you sure you want to do this?

Type 'yes' to continue, or 'no' to cancel:"

When I answer yes, the script stops... is it possible to make it say yes by default?

Thanks!

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