snipped for ediff with emacsclient for POSIX shells

.profile

### editor
export ALTERNATE_EDITOR=emacs
export EDITOR="emacsclient -tc -a emacs"
export VISUAL="emacsclient -c -a emacs"
# emacsclient as difftool
function ediff () {
    if [ "X${2}" = "X" ]; then
        echo "USAGE: ediff <FILE 1> <FILE 2>"
    else
        quoted1=${1//\\/\\\\}; quoted1=${quoted1//\"/\\\"}
        quoted2=${2//\\/\\\\}; quoted2=${quoted2//\"/\\\"}
        emacsclient -tc -a emacs -e "(ediff \"$quoted1\" \"$quoted2\")"
    fi
}