Shell configurations

According to Bash's man:

• /bin/bash
  • The bash executable
• /etc/profile
  • The system-wide initialization file, executed for login shells
• ~/.bash_profile
  • The personal initialization file, executed for login shells
• ~/.bashrc
  • The individual per-interactive-shell startup file
• ~/.bash_logout
  • The individual login shell cleanup file, executed when a login shell exits
• ~/.inputrc
  • Individual readline initialization file

With zsh, .zshrc is always read for an interactive shell, whether it's a login one or not.