Bash prompt with the last exit code

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As you are starting to border on a complex PS1, you might consider using PROMPT_COMMAND. With this, you set it to a function, and it will be run after each command to generate the prompt.

You could try the following in your ~/.bashrc file:

PROMPT_COMMAND=__prompt_command    # Function to generate PS1 after CMDs

__prompt_command() {
    local EXIT="$?"                # This needs to be first
    PS1=""

    local RCol="\[\e[0m\]"

    local Red='\[\e[0;31m\]'
    local Gre="\[\e[0;32m\]"
    local BYel="\[\e[1;33m\]"
    local BBlu='\[\e[1;34m\]'
    local Pur="\[\e[0;35m\]"

    if [ $EXIT != 0 ]; then
        PS1+="${Red}\u${RCol}"        # Add red if exit code non 0
    else
        PS1+="${Gre}\u${RCol}"
    fi

    PS1+="${RCol}@${BBlu}\h ${Pur}\W${BYel}$ ${RCol}"
}

This should do what it sounds like you want. Take a look a my bashrc‘s sub file if you want to see all the things I do with my __prompt_command function.

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