Being a genuine newbie (defecting from MS) I have five basic questions:

1) do I need root rights to install programs?  I suppose that it depends on 
the path of installation - but I am unsure as to how to specify them. Most 
programs when installed seem to "choose" their paths.  I was told that it is 
dangerous to log on as root - hence I would like to find a way to make ALL 
my installations logged as a user and not as a root.
2) how can I check the rights of a user?
3) how do I check the status of a variable? for example, I can set 
"history=220" - but do I check the status of history
4)how do you do an "uninstall" of an installed software.  How do I know 
where all the files were installed?
last question:
some programs are started by the command ./nameoftheprogram

what does this mean?  were can I find help on the ./ command?

many thanks!
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