[clue-tech] Odd file

[T.]

Hi all,

   I'm getting back into Linux after a few years away, & last night I 
noticed something really odd on my new Gentoo box - while going through 
the files on my system in preparation for installing AIDE, I found an 
executable file named '[' (that's just [ without the quotes) in my /bin 
directory.  It has a size of 20652, ownership of root/root, & shows only 
one link to it.  (To add to my unease, there appears to be no man page 
entries for this executable.)

   Now maybe things have changed since I've used Linux, or perhaps I 
simply never noticed that file before, or just *maybe* it's a Gentoo 
thing - but I'd like to get the proverbial "second opinion".  The output 
of the 'file' command lists it as a:

  "32-bit LSB executable, Intel 80386, Version 1 (SYSV) for GNU/Linux 
2.4.1, dynamically linked (uses shared libs), stripped"

   I'm not *too* concerned that I've been "0wn3d", since this box has 
had *very* minimal exposure to the internet, and besides, if it were 
part of a rootkit, I probably wouldn't even see the file with ls - but 
it *does* have me wondering a bit...

Thoughts/feedback appreciated.

T.
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