Strange program "[" in usr/bin, what is it?

I just noticed this, but when I try to run it, it says command not found. What is it? It's a program simply named [.



Here's a screenshot I made of it.

Reply 1 : Strange program "[" in usr/bin, what is it?

It's part of coreutils, test

Code:

apt-file search '/usr/bin/['
coreutils: /usr/bin/[

edit: Er OK, it's not test *exactly*, a bit of trivia here I just learned:

http://git.savannah.gnu.org/gitweb/?...7ffd712fdd8a3f

via comments in http://www.screenage.de/blog/2008/01...srbin-anymore/

Reply 2 : Strange program "[" in usr/bin, what is it?

Thanks for the informative answer as always allurgroceries!