Description:
------------
here's a script, mod_files.sh, in ext/session for creating directory
tree with depth X for sessions.  As it stands, it's pretty poorly
documented and very basic.  I got exceptionally bored and rewrote most
of it, the patch is attached.  It runs fine for me in linux (with sh
version 4.0).  I don't have any other *NIX systems to test it out on,
so I can't verify that it works in anything but linux, sorry.

What I changed:

1. Usage now properly reflects arguments, and is better explained.
2. Will create directory given if it doesn't exist
3. Will hop into interactive select if directory already has contents
4. Switched from "test" to "[[ ]]" as it's easier to read and _should_
be just as supported.

Reproduce code:
---------------
Patch is available at

http://pastebin.ca/1520039



Expected result:
----------------
(Old behavior)

$ sh mod_files.sh
usage: mod_files.sh basedir depth

$ sh mod_files.sh /foo 3
mod_files.sh: line 13: test: : integer expression expected
mkdir: cannot create directory `/foo/0': No such file or directory


Actual result:
--------------
(New behavior)

$ sh mod_files.sh
Usage: mod_files.sh BASE_DIRECTORY DEPTH MAJOR_PHP_VERSION
BASE_DIRECTORY will be created if it doesn't exist
DEPTH must be an integer number >0
MAJOR_PHP_VERSION should be one of 4, 5, or 6

$sh mod_files.sh /foo 3 5
Directory /foo is not empty! What would you like to do?
1) Delete directory contents  3) Quit
2) Choose another directory
#? 1
Deleting /foo contents...
Creating session path in /foo with a depth of 3 for PHP Version 5.X