How to append one file to another in Linux from the shell?

Question

I have two files: file1 and file2. How do I append the contents of file2 to file1 so that contents of file1

Answer 1

Another solution:

cat file1 | tee -a file2

tee has the benefit that you can append to as many files as you like, for example:

cat file1 | tee -a file2 file3 file3

will append the contents of file1 to file2, file3 and file4.

From the man page:

-a, --append
       append to the given FILEs, do not overwrite