.bash_history file in my web space

[#1]

Hello all,
I've heard of 'bash'  but that's as far as it goes. However, I found a .bash_history file in my web space today which shows commands cd and ls, which I assume are change directory and list. It looks like 'someone' has been trying to find some downloadable files I have. Is this normal? Should someone be able to access my web space using bash commands in this way?
Thanks for any help,
Barry.

[#2]

Is that on ccgi or the normal homepages?

[#3]

ccgi.
Many thanks,
Barry.

[#4]

Have you checked the date time on the file? It could have been PN when they were moving everything across to the new ccgi servers and had to check some sites for problems.
(The date on mine is Oct 2008 - before the shell lockdown)

[#5]

The date says 19/04/2010. The site's only been up for a few weeks.
Here is the code with the real directory and php file names changed:

ls -l
cd cgi-bin/
ls
cd ..
cd directory_with_unguessable_name
ls -l
more interesting_file.php 

The directory_with_unguessable_name 'should' only be know to someone who I've sent a direct link to.
Would more interesting_file.php list the contents of that file?
Thanks for any help,
Barry.

[#6]

The ccgi upgrade was all finished before the end of March.
More does list the contents of the file.
I'm wondering if someone from PN took a look at your website as a result of http://community.plus.net/forum/index.php/topic,85268.0.html

[#7]

I think I need couple of things clarified:
1) Are Plusnet responsible for the bash activity on my ccgi space on 19/04/2010.
2) If not, then how is someone able to access and read the contents of my php files using bash commands?
Either way, I need to find out as this is very important for both privacy and security. I'd be surprised if it were Plusnet, because when they removed my site due to bandwidth overuse, they actually removed the normal www space and not the ccgi where my site is hosted.
Thanks jelv  for your help,
Barry.