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If I have two text files, file1.txt.and file2.txt, how do I append the contents of file2.txt to file1.txt (without overwriting file1.txt) using a simple command-line?

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As far as I know, the simplest way would be:

cat file2.txt >> file1.txt

Reference: Appending Redirected Output.

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Bash redirection would be my first choice but if you're dealing with squiffy permissions (eg the file is root-owned), I would use tee. Here's an example where we're pretending file1.txt is owned by root (or at least, isn't writable by $USER):

cat file2.txt | sudo tee -a file1.txt
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