Append the contents of one file to another

I often have to append a file to another file, usually when I’m adding a new key to a server’s authorized_keys file. So, here’s an example…

small_file.txt contains the following text:

my secret key

large_file.txt contains the following text:

some other secret key

To append the contents of small_file.txt to large_file.txt run the following command:

cat small_file.txt >> large_file.txt

That will result in the contents of large_file.txt looking as follows:

some other secret key
my secret key
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