My goal is to have Emacs w3m open current Safari page
Somehow instead of sending the variable it send literal string $KMVAR_SafariURL
Thank you 
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Because the $KMVAR is inside a single quoted string (it is also inside double quotes, but that is irrelevant).
Change it to something like:
/usr/local/bin/emacsclient -e '(w3m-browse-url "'"$KMVAR_SafariURL"'")'
So you have a single quoted string '(w3m-browse-url "' (which itself ends in a double quote), and then a double quoted string "$KMVAR_SafariURL" (containing the variable, and hiding any spaces or other characters inside the double quotes), and then a single quoted string '")' (which starts with a double quote).
Sweet, it work really well. Thank you !!
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