Customize Your Bash Prompt: Colors, Variables, and Multi‑Line Layouts

How to Set the Bash Prompt

Bash displays a prompt defined by the PS1 environment variable; for multi‑line prompts, PS2 is used. You can change these variables directly in the shell or, more permanently, by adding export statements to your ~/.bashrc file.

export PS1="[Linux Rulez]$"
export PS2="..."

Where the Default PS1 Value Comes From

The system’s default prompt is set in /etc/bashrc. A typical default assignment looks like this:

["$PS1" = "\s-\v\$"] && PS1="[\u@\h \W]\$"

If the current PS1 matches the default pattern, Bash replaces it with [\u@\h \W]\$. To avoid overwriting system files, place your custom export PS1=… lines in ~/.bashrc instead of editing /etc/bashrc.

Common Escape Sequences in PS1

\u

– username \h – short hostname \W – basename of the current working directory ("~" for home) \s – name of the shell (e.g., bash) \v – shell version

Additional Useful Escape Sequences

\d

– date in "Tue Jun 27" format \D{fmt} – custom date format (see man strftime) \D{%c} – locale‑aware date and time \n – newline (for multi‑line prompts) \w – full current working directory path \H – full hostname

Creating a Multi‑Line Prompt

When the prompt becomes long, you can split it onto two lines using \n. The following example shows the first line with date, time, and directory, and the second line with username and hostname:

PS1="\D{%c} \w
[\u@\H]$ "

Adding Colors to the Prompt

Colors are added with ANSI escape sequences wrapped in \[ ... \]. Below is an example that makes the date red, the directory cyan, and the username appear with a yellow background:

PS1="\[\e[31m\]\D{%c}\[\e[0m\] \[\e[36m\]\w\[\e[0m\]
[\[\e[1;43m\]\u\[\e[0m\]@\H]$ "

Resulting prompts may look like the following screenshots: