This I don't understand: so what does the
"." stand for?
"." is the current directory.
From the man page of "ln"
SYNOPSIS
ln [OPTION]... TARGET [LINK_NAME]
--> ln [OPTION]... TARGET... DIRECTORY
ln [OPTION]... --target-directory=DIRECTORY TARGET...
[...]
When using the second form with more
than one TARGET, the last argument must be a
directory; create links in DIRECTORY to each TARGET.
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