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

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

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

Use cat{{}} command 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.