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I just upgraded to macOS Catalina and the new shell is ZSH. So, since it's a fresh start, I'm trying to set up my shell environment with aliases, functions, etc. like I had in bash. I'm trying to figure out what goes where, when I ran across this in the documentation

Commands are then read from $ZDOTDIR/.zshenv. If the shell is a login shell, commands are read from /etc/zprofile and then $ZDOTDIR/.zprofile. Then, if the shell is interactive, commands are read from /etc/zshrc and then $ZDOTDIR/.zshrc. Finally, if the shell is a login shell, /etc/zlogin and $ZDOTDIR/.zlogin are read.

The confusing bits...

  • If it's a login shell it reads from /etc/zprofile and then $ZDOTDIR/.zprofile
  • Finally, if the shell is a login shell, /etc/zlogin and $ZDOTDIR/.zlogin are read.

If I SSH to my Mac, it's a login shell. So since I need to configure that, which files do I need to (or should) modify? I guess to help answer that question it probably would help to understand the difference between .zprofile and .zlogin So, any guidance here would be awesome.

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The *profile files and the *login files are read under the same conditions: if and only if the shell is a login shell (and not invoked with an option such as no_rcs). The manual lists them separately because they're invoked in a different order relative to the *rc files.

The name *profile comes from sh, the Bourne shell (which ksh, bash, dash and others are mostly reimplementations of with extra features). The name *login comes from csh. Zsh is more sh-like but has features from both, so I guess that's why it supports both names.

Often it doesn't matter whether you use *profile or *login. But *profile files have the advantage that they're read before *rc, so if you have *rc content that depends on settings from *profile (for example, if your .zshrc calls a program which is in a directory that .zprofile adds to $PATH), you need to use *profile and not *login.

So put login-time configuration (usually mostly environment variables) in ~/.profile, and interactive configuration (prompt, completion, key bindings, aliases, …) in ~/.zshrc. You'll rarely need the other startup files.

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    That last sentence in the first paragraph is what should be in the ZSH documentation! – Allan Apr 14 at 14:53

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