vimrc and vim configuration files

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Within vim, type :scriptnames
to have a list of configuration files read by vim on start up.

When a setting does not take effect, you may check whether it was overriden by another configuration file.
For example, to check when the setting textwidth was last set, do:

:verbose set textwidth?

which may reply:
        Last set from /etc/vim/vimrc
Press ENTER or type command to continue