Terminal zsh: operation not permitted (Full disk access granted)

A couple of observations.

1. Probably an executable binary that expects command-line arguments and you are providing none.
2. In System Preferences : Security & Privacy : Privacy panel : Full Disk Access
   1. If Terminal is not in there and selected, then click + and using the file chooser, navigate to the Terminal application, and select it.
   2. If Terminal is already there and selected, then click + and then same drill, locate the makeprojdir executable as shown in your previous post, and select it to add to Full Disk Access.

Since full disk access is granted, what syntax is within the ./makeprojdir script that Zsh does not like, or are you attempting a write operation on the read-only System partition?

Is the ./makeprojdir a script, and if so, are there commands in it that Zsh does not support, misspelled, etc.

Where did you get the script?

downloaded

Well, that's particularly helpful to determine what it is doing so we can figure out why it doesn't work.

We should have a solution shortly.