Opening multi emacs instances with different settings

working_with_multi_emacs_configurations.md

In Mac OS:

open -a Emacs -n --args -q --eval='(setq user-emacs-directory "~/dot.emacs")'  -l ~/dot.emacs/init.el

In console line:

emacs -q --eval='(setq user-emacs-directory "~/dot.emacs")'  -l ~/dot.emacs/init.el

Source: https://www.reddit.com/r/emacs/comments/2y1b3a/how_can_i_easily_keep_different_emacsd_folders/cp5u2mv/

ZSH:

openemacs() {
    # this function receives a folder name that's inside of ~/emacs folder
    # it's useful when we want to open multi emacs instances with different settings files
    eval='(setq user-emacs-directory "~/emacs/$1/")'
    eval=${eval/\$1/$1}
    open -a Emacs -n --args -q --eval=$eval  -l ~/emacs/$1/init.el
}

$ openemacs yourfolder

This works for Bash and ZSH

openemacs() {
    # this function receives a folder name that's inside of ~/emacs folder
    # it's useful when we want to open multi emacs instances with different settings files

    EMACS_USER_FOLDER="$HOME/emacs/$1/"
    EMACS_USER_INIT_FILE="$HOME/emacs/$1/init.el"
    EVAL_EMACS="'(setq user-emacs-directory \"$EMACS_USER_FOLDER\")'"
    eval "open -a Emacs -n --args -q --eval=$EVAL_EMACS  -l $EMACS_USER_INIT_FILE"
}