Can I remove all non-zsh related shell files on Catalina since bash is being deprecated in favor of zsh?

Question

macOS will be using zsh moving forward and we can set zsh as the default shell in Catalina which I have done. With Catalina is it ok if I remove all traces of bash and oh-my-zsh since zsh is now the default shell? Also I am using Hyper Terminal which means I do not need oh-my-zsh any longer right.

Example:
The Anaconda installer added this script originally to my bashrc or bash_profile so I copied it over to .zshrc when I switched to zsh. I recently read I didn't need to/shouldn't have copied it over since it was meant for the bash_profile but now that macOS is moving to use zsh anyway I'd like to know what I should do. Obviously I need to tell zsh where Anaconda is but do I need that script or can I just export the Anaconda path like export PATH=/Users/ty604/anaconda3/bin:$PATH?

Can I just leave this Anaconda script in zshrc and remove all traces of bash to future-proof my Mac when bash is gone?

export PATH=/Users/ty604/anaconda3/bin:$PATH

# added by Anaconda3 2019.03 installer
# >>> conda init >>>
# !! Contents within this block are managed by 'conda init' !!
__conda_setup="$(CONDA_REPORT_ERRORS=false '/Users/ty604/anaconda3/bin/conda' shell.bash hook 2> /dev/null)"
if [ $? -eq 0 ]; then
    \eval "$__conda_setup"
else
    if [ -f "/Users/ty604/anaconda3/etc/profile.d/conda.sh" ]; then
        . "/Users/ty604/anaconda3/etc/profile.d/conda.sh"
        CONDA_CHANGEPS1=false conda activate base
    else
        \export PATH="/Users/ty604/anaconda3/bin:$PATH"
    fi
fi
unset __conda_setup
# <<< conda init <<<

I also have many duplicate paths in $PATH because of duplicate export commands in various shell files.
$ echo $PATH
/Users/ty604/anaconda3/bin:/Users/ty604/anaconda3/condabin:/Users/ty604/anaconda3/bin:/Users/ty604/.cargo/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/VMware Fusion.app/Contents/Public:/usr/local/share/dotnet:/Users/ty604/flutter/bin

Files in my system
.bash_history, .bash_profile, .bashrc, .profile, .zprofile, .zsh_history, .zshrc, .zshrc.pre-oh-my-zsh

Folders in my system
.bash_sessions, .oh-my-zsh, .zsh

Answer 1

The shell initialisation code that you show does not look bash-specific and should work with zsh as well, assuming that the various script that it sources are working too (shell.bash and conda.sh). If there is a shell.zsh script you could obviously choose to use that instead of shell.bash.

---

In the zsh shell, the PATH variable is tied to the path array. You can make both contain only unique entries using typeset -U.

This is an example using your particular value of for PATH:

$ print -rC1 -- $path
/Users/ty604/anaconda3/bin
/Users/ty604/anaconda3/condabin
/Users/ty604/anaconda3/bin
/Users/ty604/.cargo/bin
/usr/local/bin
/usr/bin
/bin
/usr/sbin
/sbin
/Applications/VMware Fusion.app/Contents/Public
/usr/local/share/dotnet
/Users/ty604/flutter/bin

The path /Users/ty604/anaconda3/bin is duplicated at the start. To make the paths unique (now and in the future):

$ typeset -U PATH path
$ print -rC1 $path
/Users/ty604/anaconda3/bin
/Users/ty604/anaconda3/condabin
/Users/ty604/.cargo/bin
/usr/local/bin
/usr/bin
/bin
/usr/sbin
/sbin
/Applications/VMware Fusion.app/Contents/Public
/usr/local/share/dotnet
/Users/ty604/flutter/bin

See also what happens if I push /bin onto the start of the path:

$ path=( /bin $path )
$ print -rC1 -- $path
/bin
/Users/ty604/anaconda3/bin
/Users/ty604/anaconda3/condabin
/Users/ty604/.cargo/bin
/usr/local/bin
/usr/bin
/usr/sbin
/sbin
/Applications/VMware Fusion.app/Contents/Public
/usr/local/share/dotnet
/Users/ty604/flutter/bin

(The second /bin is deleted.)

Since the path array is tied to the PATH variable, the changes will be visible there too:

$ print -rC1 -- $PATH
/bin:/Users/ty604/anaconda3/bin:/Users/ty604/anaconda3/condabin:/Users/ty604/.cargo/bin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/Applications/VMware Fusion.app/Contents/Public:/usr/local/share/dotnet:/Users/ty604/flutter/bin

Answer 2

I have since found out that zsh does have a hook which means I can remove all instances of bash shell since the system $PATH is being sourced from etc/profile anyway.

macOS default shell is now zsh so for me, there is no use for bash files.