How to copy the contents of one file to the end of another file in Linux

Problem description:

For example, the file content of 11 is:

hello

22’s file content is:

world

Copy after login

Copy the content of file 22 to the end of file 11. The effect of file 11 is:

hello
world

Solution:

cat 22 >> 11

cat /dev/null > a.txt

linux tutorial

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