arthas/tutorials/katacoda/command-cat-en/cat.md

First write `hello, world` into `/tmp/a.txt`:

`echo "hello, world" > /tmp/a.txt`{{execute T2}}

Use `cat` to concatenate and print files, which is pretty much alike in linux.

`cat /tmp/a.txt`{{execute T2}}

Then you can see that `hello, world` has been printed out.