Shell & Prompt

XDG User Directories

export XDG_CONFIG_HOME=$HOME/.config            # Where user-specific configurations should be written (analogous to /etc).
export XDG_CACHE_HOME=$HOME/.cache  # Where user-specific non-essential (cached) data should be written (analogous to /var/cache).
export XDG_DATA_HOME=$HOME/.local/share             # Where user-specific data files should be written (analogous to /usr/share).
export XDG_STATE_HOME=$HOME/.local/state            # Where user-specific state files should be written (analogous to /var/lib).

Shell

Bash:

export BASH_COMPLETION_USER_FILE="$XDG_CONFIG_HOME"/bash-completion/bash_completion

ZSH:

export ZDOTDIR=$XDG_CONFIG_HOME/zsh                                       # ZSH home

Oh My Zsh

export ZSH="$ZDOTDIR/ohmyzsh"                                             # ohmyzsh installation.

Prompt

Starship

export STARSHIP_CONFIG=$XDG_CONFIG_HOME/starship.toml                     # Starship configuration
export STARSHIP_CACHE=$XDG_CACHE_HOME/starship                            # Starship configuration cache

Window Manager

Sway

export SWAY_HOME=$XDG_CONFIG_HOME/sway/                                   # Sway configuration files