Linux – How to execute a PL file in Linux

There is a very detailed cookbook guide in this article : L2TP/IPSec VPN client on Fedora.
It is even pretty recent, from October 1, 2014.

It lists the packages to install :

libreswan
xl2tpd

And the files that require editing :

/etc/ipsec.d/desired_vpn_name.conf
/etc/ipsec.d/desired_vpn_name.secrets
/etc/xl2tpd/xl2tpd.conf
/etc/ppp/options.xl2tpd.VPN_CONNECTION_NAME
/var/run/xl2tpd/l2tp-control

_{(The article is pretty much to the point, so no reason to reproduce it here entirely.)}

Vim has a built-in plugin called netrw, which allows Vim to edit remote files. Rsync is one of the protocols it can use:

:e rsync://user@hostname:port/path
:w rsync://user@hostname:port/path

Of course, if you have SSH access to the remote machine, and Vim is installed on it, it may be simpler to just use Vim remotely. Nano, Emacs, and other editors with command line interfaces are also options in that case. Depending on just how bad your connection is, though, this might not be a pleasant option.

That all said,

making hundreds of tiny changes to files which are remotely hosted and which must be edited "live" and "in place"

without a reliable rollback system such as what git can provide is you and your organization just begging for agony when you make the inevitable mistakes which may very well go unnoticed until you've forgotten exactly what you did.