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When I did the command above, X11 opened. I am perplexed. Did I run it? How can I be sure that I do not run any program when looking at things? I really hate the idea that reading a text file may execute a program. How is it programmable possible to make programs that executes when running a simple cat-command, or similar command?
If you run
you should see that this is not a normal ‘text’ file but a socket. Aliasing
lsthuswill help identify such files automatically in your shell.