How to initialize oh-my-posh with bash (macOS), bash (WSL, Ubuntu), cmd, zsh and pwsh

.bashrc

# for bash (macOS)
POSH_THEMES_PATH=$(brew --prefix oh-my-posh)/themes
eval "$(oh-my-posh completion bash)"
eval "$(oh-my-posh init bash --config "$POSH_THEMES_PATH"/clean-detailed.omp.json | sed 's|\[\[ -v MC_SID \]\]|[[ -n "$MC_SID" ]]|')"

.profile

# for bash (Ubuntu, WSL)

# # Download the themes before getting started.
# sudo apt install curl unzip
# mkdir ~/.poshthemes
# curl -L https://github.com/JanDeDobbeleer/oh-my-posh/releases/latest/download/themes.zip -o ~/.poshthemes/themes.zip
# unzip ~/.poshthemes/themes.zip -d ~/.poshthemes
# chmod u+rw ~/.poshthemes/*.json
# rm ~/.poshthemes/themes.zip

eval "$(oh-my-posh completion bash)"
eval "$(oh-my-posh init bash --config ~/.poshthemes/clean-detailed.omp.json)"

.zshrc

# for zsh
autoload -Uz compinit
compinit

POSH_THEMES_PATH=$(brew --prefix oh-my-posh)/themes
eval "$(oh-my-posh completion zsh)"
eval "$(oh-my-posh init zsh --config "$POSH_THEMES_PATH"/clean-detailed.omp.json)"

Microsoft.PowerShell_profile.ps1

# Before editing PROFILE script, make sure the PROFILE directory exists.
# mkdir -Path (Get-Item -Path $PROFILE).Directory.FullName -ErrorAction SilentlyContinue

# for PowerShell (macOS)
if ([Environment]::OSVersion.Platform -eq [PlatformID]::MacOSX) {
  $env:POSH_THEMES_PATH = Join-Path -Path "$(brew --prefix oh-my-posh)" -ChildPath themes
  [scriptblock]::Create($(oh-my-posh completion powershell)).Invoke()
  oh-my-posh init pwsh --config "$env:POSH_THEMES_PATH/clean-detailed.omp.json" | iex
}

# for PowerShell (Windows)
if ([Environment]::OSVersion.Platform -eq [PlatformID]::Win32NT) {
  $env:POSH_THEMES_PATH = Join-Path -Path (Get-Item -Path (Get-Command -Name 'oh-my-posh').Source).Directory.Parent.FullName -ChildPath 'themes'
  [scriptblock]::Create($(oh-my-posh completion powershell)).Invoke()
  oh-my-posh init pwsh --config "$env:POSH_THEMES_PATH/clean-detailed.omp.json" | iex
}

# for PowerShell (Linux, Ubuntu)
# # Download the themes before getting started.
# sudo apt install curl unzip
# mkdir ~/.poshthemes
# curl -L https://github.com/JanDeDobbeleer/oh-my-posh/releases/latest/download/themes.zip -o ~/.poshthemes/themes.zip
# unzip ~/.poshthemes/themes.zip -d ~/.poshthemes
# chmod u+rw ~/.poshthemes/*.json
# rm ~/.poshthemes/themes.zip
if ([Environment]::OSVersion.Platform -eq [PlatformID]::Unix) {
  $env:POSH_THEMES_PATH = Join-Path -Path $Home -ChildPath '.poshthemes'
  [scriptblock]::Create($(oh-my-posh completion powershell)).Invoke()
  oh-my-posh init pwsh --config "$env:POSH_THEMES_PATH/clean-detailed.omp.json" | iex
}

oh-my-posh.lua

-- Install clink via "winget install Clink".
-- Then, create oh-my-posh.lua file in the "%localappdata%\clink\oh-my-posh.lua".
-- Note: Clink version does not support auto-completion feature.

load(io.popen('oh-my-posh init cmd --config '
 .. os.getenv("localappdata")
 .. '\\Programs\\oh-my-posh\\themes\\clean-detailed.omp.json'):read("*a"))()