How to say 'yes' for all questions, when using 'portmaster'.

I am trying to install many ports with portmaster(1).

Code:
cat /root/port_list

editors/vim
www/apache24
www/xchace
...
...

If I run portmaster `cat /root/port_list`, portmaster(1) will install but will ask questions, such as:

Code:
Delete gettext-1.05.tar.gz? y/n [n]

How to say yes to all the questions? I have tried portmaster -ty `cat /root/port_list`, but it does not work.
 
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