Lets take a look at how to customize a bash shell. We’ll be making our shell print a table flip whenever the last command failed. In order to customize your prompt you can overwrite the PS1 environment variable.

To see what your current prompt is set to you can run echo "$PS1"

The table flip script looks like this:

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table_flip() {
  if [[ "$?" == "0" ]]; then
    echo ""
  else
    echo "(╯°□°）╯︵ ┻━┻"
  fi
}

Here is a tool that can help you customize your prompt more easily: http://ezprompt.net/

The ArchLinux wiki goes into much more detail about prompt customization: https://wiki.archlinux.org/index.php/Bash/Prompt_customization#Bash_escape_sequences

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