Just to let you know (probably you know it already): updating the shell from "bash" to "zsh" does not change the practical result, in that fortran keeps on being "not found" (a colleague of mine tried it today).

By the way, this is the Terminal of a MacBook Air after Catalina.

this is the link suggested by Apple with info concerning the shift from "bash" to "zsh":

https://support.apple.com/en-us/HT208050

Have a nice day

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