1. “Option” + letter sometimes binds to special token. To cancel that, try

How to disable generating special characters when pressing the alt+a/option+a keybinding in Mac OS (⌥+a )?

1. Mac Bash Terminal and Linux Bash Terminal have different results for a same command

mac bash does not support “paste sd+”

1. disable Terminal beep

How can I get the Mac Terminal to not beep?

Tips

1. right click a file, press Option (choose ‘always open file with’)
2. open Appicon.ics to get the app logo