Appending one text file to another

Hi,
I have a huge text file which is basically a load of Spam email. I've now got more text files of spam that I want to append onto the old one. I can't for the life of me remember how to do it at the command line. Can anyone help?
Cheers,
Stu

cat file1 file2 > file3
concatenates file1 and file2 and writes the result to file3.

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