A few shell things to make working with emacs nicer (OSX focus)...

emacs-related.sh

# one command to start a new Cocoa Emacs as installed by brew
# (make sure the path matches where you have emacs installed, obvs)
alias startemacs=/usr/local/Cellar/emacs-mac/emacs-26.3-z-mac-7.7/Emacs.app/Contents/MacOS/Emacs.sh

# then typing `emacs foo` should open the file in the already running Cocoa emacs 
alias emacs=/usr/local/Cellar/emacs-mac/emacs-26.3-z-mac-7.7/bin/emacsclient

# default editor and git editor should do the same
export EDITOR=/usr/local/Cellar/emacs-mac/emacs-26.3-z-mac-7.7/bin/emacsclient
export GIT_EDITOR=/usr/local/Cellar/emacs-mac/emacs-26.3-z-mac-7.7/bin/emacsclient

# This allows one to type at the shell:
# $ command | pipe-emacs
# ... to get a new emacs buffer containing the output of `command`.
pipe-emacs() {
  local TMP;
  TMP="$(mktemp /tmp/emacsstdinXXX)";
  cat >"$TMP";
  /usr/local/Cellar/emacs-mac/emacs-26.3-z-mac-7.7/bin/emacsclient --eval "(let ((b (create-file-buffer \"*stdin*\"))) (switch-to-buffer b) (insert-file-contents \"${TMP}\") (delete-file \"${TMP}\"))"  > /dev/null 2>&1
}

# syncs the shell path with MacOSX programs not run from the shell, for
# example those launched by the Finder, Spotlight, &c
defaults write $HOME/.MacOSX/environment PATH "$PATH"