Macos – Migrating from bash to zsh for Mac OS Catalina

As some of you may know, after upgrading to Mac OS Catalina, Apple is prompting users to migrate to zsh as the default shell.

Now, there is a warning that comes up every time bash is opened. It can be disabled adding the line below to your ~/.bash_profile (for those interested).

export BASH_SILENCE_DEPRECATION_WARNING=1

However, I figure that many (including me) want to move on to zsh.

My current ~/.bash_profile looks like below:

# searches this directory for executables first
export PATH="/usr/local/bin:$PATH"

# jenv
export PATH="$HOME/.jenv/bin:$PATH"
eval "$(jenv init -)"

# rbenv
export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"

# pyenv
export PATH="$HOME/.pyenv/bin:$PATH"
eval "$(pyenv init -)"

# nodenv
export PATH="$HOME/.nodenv/bin:$PATH"
eval "$(nodenv init -)"

# node-build-definitions
export NODE_BUILD_DEFINITIONS="/usr/local/opt/node-build-update-defs/share/node-build"

# bash auto-completion
if [ -f $(brew --prefix)/etc/bash_completion ]; then
  . $(brew --prefix)/etc/bash_completion    
fi

# git branch in prompt
parse_git_branch() {
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'
}

# bash profile theme
export PS1="\[\e[1;37m\]parthnaik:\[\033[33;1m\]\w\[\033[m\]\$(parse_git_branch) \n$ "
export CLICOLOR=1
export LSCOLORS=GxFxCxDxBxegedabagaced

# firevault memory security
alias sleepsafe='sudo pmset -a destroyfvkeyonstandby 1 hibernatemode 25 standby 0 standbydelay 0'
alias sleepdefault='sudo pmset -a destroyfvkeyonstandby 0 hibernatemode 3 standby 1 standbydelay 10800'

# enable / disable captive portal
alias disablecaptiveportal='sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.captive.control Active -bool false'
alias enablecaptiveportal='sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.captive.control Active -bool true'

I was hoping someone more knowledgeable than me can help me understand what goes where since there seems to be some conflicting information online.

So far, from what I have read, here are the different suggestions I have seen:

1. Copy pasting ~/.bash_profile to ~/.zshrc.
2. Adding the following code at the bottom of ~/.zshrc:

if [ -f ~/.bash_profile ]; then 
    . ~/.bash_profile;
fi

3. Creating a ~/.aliases file and a ~/.paths file and then sourcing/importing them to both ~/bash_profile as well as ~/.zshrc to maintain backward compatibility.

In addition to this, I have a .sh script that runs everyday automatically via command like:

sh script_name.sh

Should I change be changing this to use zsh like shown below? This should be the case if all .sh scripts with bash and zsh.

zsh script_name.sh

Looking for advice and best practises for migration although I know that any of the above would work in terms of functionality. Ideally, would like my theme, autocompletions and git branch settings (as shown in the ~/.bash_profile above) to work the same way as they do now.

For the theme, I know that there is a plugin called 'oh-my-zsh' available as well. Is this recommended to be installed?

Thank you for the help!