Add to PATH on any UNIX system with something like .bash_rc
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I'd like for my application to add its own `bin` directory to the path in a means that works across all shells (and, indeed, multiple shells) across all UNIXes. Is this possible?

Specifically, the goal to to add `~/.myapp/bin/` a part of the user's path.

Simply appending `export PATH=~/.myapp/bin:$PATH` to `.bashrc` won't work—what about zsh users etc? Also, I'm not sure that this is even reliable across all shell-supported platforms.