Terminal on Mac - Delete key behavior

Solution 1:

The answer to the question to which you linked shows how to find the control sequence Terminal sends when you press FnBackspace: echo 'ControlV FnBackspace' | od -c.
The ControlV is critical to prevent special interpretation of the (likely) initial ESC character.

Terminal probably sends the four byte sequence ESC [ 3 ~.

The question to which you linked was asking about zsh. The comment on the answer gives the command to bind the sequence in zsh, i.e:

bindkey "^[[3~" delete-char

(usually in ~/.zhsrc).

However, bash is the default shell on Mac OS X, so the command to bind a key (and the functions available for binding) will be different if you are using bash: bind '"\e[3~": delete-char'. You will probably want to put this in a bash startup file¹.

If you find that you are using bash, but you want to use zsh instead, then there are two ways to change your effective shell:

• Use chsh -s /bin/zsh to change your default shell.
  This will change the shell that Terminal starts as well as the shell started for other login sessions (e.g. logins through SSH).
• Configure just Terminal to use a different shell in Terminal’s preferences.
  Terminal > Preferences…, Settings tool bar button, then the Shell tab,
  change Run Command to (e.g.) /bin/zsh -l.

¹ Usually ~/.bashrc, but you can also put a related line ("\e[3~": delete-char) in ~/.inputrc instead. If you put it your .bashrc, you will want to make sure that you also have a line like source ~/.bashrc in ~/.bash_profile, or ~/.bash_login (if you have neither, then create the former; if you already have exactly one of them, then use the one you have; if you have both, then you should fix that since probably only the former is being used).