In the examples below, I am creating the file1.txt, file2.txt and file3.txt and then I paste the contents of them to the screen, or a second file1 and file2.txt, or file1-3.txt and then display the results for verification.
-rw-r--r-- 1 wahid staff 20 2010-12-26 22:54 file1.txt
-rw-r--r-- 1 wahid staff 20 2010-12-26 22:54 file2.txt
content of file one
content of file two
content of file one content of file two
content of file one
content of file two
content of file one content of file two
content of file three
content of file one content of file two content of file three
Please click on "man paste " to see the Manual Page for this command.