They are not identical, but more they are quite compatible, most of Bash syntax and built-in commands work on Zsh as well. From what I’ve heard, Fish differs from them a lot. I use primarily Zsh, but sometimes run Bash if I need it for something (before ** started working on Zsh, I used Bash globstar when I needed it, for example).
Bash and Zsh are identical ??
They are not identical, but more they are quite compatible, most of Bash syntax and built-in commands work on Zsh as well. From what I’ve heard, Fish differs from them a lot. I use primarily Zsh, but sometimes run Bash if I need it for something (before ** started working on Zsh, I used Bash globstar when I needed it, for example).