This is the script I used in my post here: https://josephmidura.wordpress.com/2021/07/03/updating-homebrew-on-macos/

brewup

#!/bin/bash
# Update homebrew

CYAN=$(tput setaf 6)

RESET=$(tput sgr0)

echo "${CYAN}Updating homebrew and local base of available packages and versions...${RESET}"
brew update

echo "${CYAN}Upgrading outdated homebrew packages...${RESET}"
brew upgrade

echo "${CYAN}Cleaning cache of unfinished downloads...${RESET}"
brew cleanup

echo "${CYAN}Checking for issues...${RESET}"
brew doctor

Awesome, thank you!

In my case it was the .zprofile (on macOS Sonoma) and this did it. :)

I remembered the steps from Linux while following your steps, but that's years ago and I wouldn't have remembered it without your help:
I basically added 'username/bin' as a global callable directory by following your steps, so that I can call the script (scripts in general which are in any directoty listed in " echo "$PATH" | tr : '\n' ") from everywhere just by writing brewup. Right?

So again: Thank you. :)

Best regards Q

I'm glad it worked and it sounds like you're on the right track with calling scripts from directories in your $PATH.