Well, I didn't mean to be boring, but if you want to know the reasons, here comes the representative example:
1. This is machine we call "BlackBox" which means it was installed and it's been taken care of by our service partner. If we add/change/delete things that come with it (preinstalled of course) that are not covered in service agreement, we loose support. For example - there's neither mySQL nor postgreSQL installed on that machine, and will never be installed (that's the agreement).
2. Vendor of that "blackbox" is a huge multinational company that probably would eat (both our service partner and us) us if we change something they set up.
3. We don't have access rights to e.g. make and install own perl distribution.
That basically means that we can use everything that is installed, but install/upgrade/add/change/delete without service partner agrees is strictly forbidden (according to SLA). Now, we can and would like to use some things that already are installed (file with data, Perl distribution, etc.), but those are restrictions which I described as 1M reasons. I saw this as a challenge (although I'm not a programmer at all, even if my job requires a lot of C and shell scripting knowledge) and didn't mean to offend anyone...
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