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Simple colored bash prompt

Defined in /etc/profile.d/bash-color-prompt.sh

The prompt color theme can be customized simply by setting the PROMPT_COLOR envvar, and optionally PROMPT_DIR_COLOR.

For example PROMPT_COLOR='2;7' is dim inverse-video or PROMPT_COLOR='44' gives a blue background.

PROMPT_DIR_COLOR similarly changes the color of the working directory, which otherwise defaults to PROMPT_COLOR.

Coloring Examples

PROMPT_COLOR=0 # disable colors/attribs
PROMPT_COLOR=1 # bold prompt
PROMPT_COLOR=2 # dim prompt
PROMPT_COLOR=4 # underline prompt
PROMPT_COLOR='2;7' # dim reverse video
PROMPT_COLOR='42' # green background
PROMPT_COLOR='53' # overline separator
PROMPT_COLOR='1;33;44' # bold yellow on blue
PROMPT_COLOR='43;30' # black on yellow
PROMPT_COLOR='1;32' # bold green
PROMPT_COLOR='' # unset defaults to green

eval $(grep ANSI_COLOR /etc/os-release)
PROMPT_COLOR="$ANSI_COLOR"

See https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_(Select_Graphic_Rendition)_parameters for ANSI codes details.

Configurable variables

bash-color-prompt's PS1 has the following general structure: [PROMPT_START] PROMPT_USERHOST^PROMPT_SEPARATOR PROMPT_DIRECTORY^[PROMPT_END] (^ means color reset) described below:

`PROMPT_START` (optional)

Displayed at the start of the prompt.

`PROMPT_USERHOST`

Default: PROMPT_USERHOST='\u@\h'

Defaults to PROMPT_COLOR.

See the PROMPTING section of man bash or info bash for the available backslash-escaped special characters.

`PROMPT_SEPARATOR`

Default: PROMPT_SEPARATOR=':'

eg you can change it to '\n or `' \t\n'

`PROMPT_DIRECTORY`

Default: PROMPT_DIRECTORY='\w'

eg you can change it to '\W'

Defaults to PROMPT_DIR_COLOR if set or PROMPT_COLOR.

`PROMPT_END`

Displayed at the end of the prompt (before \$).

Traditional Red Hat prompt

PROMPT_START='['
PROMPT_END=']'
PROMPT_SEPARATOR=' '
PROMPT_DIRECTORY='\W'
PROMPT_COLOR='0'

Defaults functions

The traditional Red Hat prompt can be set with the prompt_traditional function.

The prompt can be reset to default with the prompt_default function.

Use the prompt_default_os function to use ANSI_COLOR from /etc/os-release.

Multiline prompt example

PROMPT_START='\t\n'
PROMPT_COLOR='30;43'
PROMPT_DIR_COLOR='44'
PROMPT_SEPARATOR='\n'

You can also set say PS0='\t' to timestamp the start of commands.

Git branch integration

function prompt_command {
    ref=$(/usr/bin/git rev-parse --abbrev-ref HEAD 2> /dev/null)
    git_branch=${ref:+:$ref}
}
PROMPT_COMMAND=prompt_command
PROMPT_END='${git_branch@P}'

Terminal title

Using bash PROMPT_COMMAND one can also set the terminal title with:

echo -n -e "\e]0;${PROMPT_USERHOST@P}${PROMPT_USERHOST:+:}${PROMPT_DIRECTORY}"

Container support

Basic container support can be setup with say:

PROMPT_START='${container:+⬢ }'

though putting it in PROMPT_USERHOST might make more sense.

Show exit code for error in red

PROMPT_END="${colorpre@P}31${colorsuf@P}'${?#0}'"%{colorreset}"

Sourcing

Set prompt_color_force (before sourcing /etc/bashrc or bash-color-prompt.sh directly) to turn on bash-color-prompt unconditionally, otherwise by default it is only setup cautiously if $TERM ends in "color" and PS1 is the fedora or bash default.

For example:

if [ -t 0 ]; then
prompt_color_force=1
source /etc/profile.d/bash-color-prompt.sh
fi

can be added to ~/.bashrc to turn on bash-color-prompt "everywhere".

Contribute

Please open issues against shell-color-prompt.

shell-color is distributed under the GPL license version 2 or later.

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