Customizing Your CLI Shell | Intro to the CLI Part 4

Shell customization in Zsh and Bash is primarily managed through configuration files such as ~/.zshrc and ~/.bashrc, which are loaded for common interactive, non-login terminal sessions, while login sessions may use files such as ~/.zshprofile. The article distinguishes interactive shells, which accept user input, from non-interactive shells used by scripts and programs, and explains how login status affects which configuration files are read. It shows how users can personalize prompts by modifying Zsh’s PROMPT variable or Bash’s PS1 variable to display dynamic details such as dates, directories, and hostnames, including adding color in Zsh or using external theme engines. It also describes aliases as shortcuts for frequently used commands, with examples for listing hidden files, making file deletion interactive by default, and simplifying Git commands, while cautioning that aliases can override existing command behavior. Finally, it notes that configuration files can run any commands whenever a new shell opens, such as displaying the current directory and its contents, and positions these customization skills as preparation for shell scripting and automation.

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