Yes, it's a different binary, and it's perfectly usual to find it in a Linux system.
But note that, at least in bash, you rarely will be using /usr/bin/[ unless you reference it using the full path (either in a relative or absolute way). This is because bash has a builtin that takes over that binary file. You can check that (or any other command) by using the "type" instruction (again, this is for bash). # LC_ALL=C type [ [ is a shell builtin The same goes for 'test'. Those binaries are probably there just in case that some init or system script written for a standard bourne shell (like the busybox one) needs it. But don't take my word for it. I am not sure right now. -- Jesús Guerrero Botella
