Difference between revisions of "Bash/Prompt customization"

From ArchWiki
Jump to: navigation, search
m (Random quotations at logon)
(Generalizing colors for all users)
Line 456: Line 456:
==Generalizing colors for all users==
==Generalizing colors for all users==
If you want to generalize the use of colors for all users in the system, you must remove your {{ic|~/.bashrc}} file, modify the {{ic|/etc/bash.bashrc}} file and create a {{ic|/etc/DIR_COLORS}} file. Here is our possible generalization of the Gentoo color scheme for Arch linux:  
If you want to generalize the use of colors for all users in the system, you must remove your {{ic|~/.bashrc}} file, modify the {{ic|/etc/bash.bashrc}} file and create a {{ic|/etc/DIR_COLORS}} file. Here is our possible generalization of the Gentoo color scheme (with some additions) for Arch linux:
Line 500: Line 500:
# following lines:
# following lines:
# if [ "$PS1" ]; then
if [ "$PS1" ]; then
# /usr/bin/fortune
# fi
# Set colorful PS1 only on colorful terminals.
# Set colorful PS1 only on colorful terminals.
Line 524: Line 524:
if ${use_color} ; then
if ${use_color} ; then
sadness='$([[ $? != 0 ]] && echo -ne "\033[01;31m:-(\033[00m ";)'
# Enable colors for ls, etc.  Prefer ~/.dir_colors #64489
# Enable colors for ls, etc.  Prefer ~/.dir_colors #64489
if type -P dircolors >/dev/null ; then
if type -P dircolors >/dev/null ; then
Line 534: Line 537:
if [[ ${EUID} == 0 ]] ; then
if [[ ${EUID} == 0 ]] ; then
PS1='\[\033[01;31m\]\h\[\033[01;34m\] \W \$\[\033[00m\] '
PS1="\[\033[01;31m\]\h\[\033[01;34m\] \W $sadness\$\[\033[00m\] "
PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
PS1="\[\033[01;32m\]\u@\h\[\033[01;34m\] \w $sadness\$\[\033[00m\] "
alias ls='ls --color=auto'
alias ls="ls --color=auto"
alias dir='dir --color=auto'
alias dir="dir --color=auto"
alias grep='grep --colour=auto'
alias grep="grep --colour=auto"
sadness='$([[ $? != 0 ]] && echo ":-( ";)'
if [[ ${EUID} == 0 ]] ; then
if [[ ${EUID} == 0 ]] ; then
# show root@ when we do not have colors
# show root@ when we do not have colors
PS1='\u@\h \W \$ '
PS1="\u@\h \W $sadness\$ "
PS1='\u@\h \w \$ '
PS1="\u@\h \w $sadness\$ "
PS2='> '
PS2="> "
PS3='> '
PS3="> "
PS4='+ '
PS4="+ "
# Try to keep environment pollution down, EPA loves us.
# Try to keep environment pollution down, EPA loves us.
unset use_color safe_term match_lhs
unset use_color safe_term match_lhs sadness
# Try to enable the auto-completion.
# Try to enable the auto-completion.

Revision as of 03:50, 7 November 2012

Template:Article summary start Template:Article summary text Template:Article summary heading Template:Article summary wiki Template:Article summary wiki Template:Article summary end There are a variety of possibilities for Bash's prompt (PS1), and customizing it can help you be more productive at the command line. You can add additional information to your prompt, or you can simply add color to it to make the prompt stand out.

Basic prompts

The following settings are useful for distinguishing the root prompt from non-root users.

  • Edit Bash's personal configuration file:
$ nano ~/.bashrc
  • Comment out the default prompt:
#PS1='[\u@\h \W]\$ '
  • Add the following green prompt for regular users:
[chiri@zetsubou ~]$ _
PS1='\[\e[1;32m\][\u@\h \W]\$\[\e[0m\] '
  • Edit root's .bashrc file; copy it from /etc/skel if the file is not present:
# nano /root/.bashrc
  • Assign a red prompt for root:
[root@zetsubou ~]# _
PS1='\[\e[1;31m\][\u@\h \W]\$\[\e[0m\] '

Slightly fancier prompts

  • A green and blue prompt for regular users:
chiri ~/docs $ echo "sample output text" sample output text chiri ~/docs $ _
PS1='\[\e[0;32m\]\u\[\e[m\] \[\e[1;34m\]\w\[\e[m\] \[\e[1;32m\]\$\[\e[m\] \[\e[1;37m\]'

This will give a very pleasing, colorful prompt and theme for the console with bright white text.

The string above contains color-set escape sequences (start coloring: \[\e[color\], end coloring: \[\e[m\]) and information placeholders:

  • \u - Username. The original prompt also has \h, which prints the host name.
  • \w - Current absolute path. Use \W for current relative path.
  • \$ - The prompt character (eg. '#' for root, '$' for regular users).

The last color-set sequence, "\[\e[1;37m\]", is not closed, so the remaining text (everything typed into the terminal, program output and so on) will be in that (bright white) color. It may be desirable to change this color, or to delete the last escape sequence in order to leave the actual output in unaltered color.

  • A red and blue prompt for root:
root ~/docs # echo "sample output text" sample output text root ~/docs # _
PS1='\[\e[0;31m\]\u\[\e[m\] \[\e[1;34m\]\w\[\e[m\] \[\e[0;31m\]\$ \[\e[m\]\[\e[0;32m\]'

This will give you a red designation and green console text.

Once you have made your changes to .bashrc, to execute your changes:

$ source ~/.bashrc

Advanced prompts

Load/Mem Status for 256colors

This is not even pushing the limits. Other than using 'sed' to parse the memory and load average (using the -u option for non-buffering), and the builtin history to save your history to your HISTFILE after every command, which you may find incredibly useful when dealing with crashing shells or subshells, this is essentially just making BASH print variables it already knows, making this extremely fast compared to prompts with non-builtin commands.

This prompt is from AskApache.com's BASH Power Prompt article, which goes into greater detail. It is especially helpful for those wanting to understand 256 color terminals, ncurses, termcap, and terminfo.

This is for 256 color terminals, which is where the \033[38;5;22m terminal escapes come from.

802/1024MB      1.28 1.20 1.13 3/94 18563
[5416:17880 0:70] 05:35:50 Wed Apr 21 [srot@host.sqpt.net:/dev/pts/0 +1] ~
(1:70)$ _
 PROMPT_COMMAND='history -a;echo -en "\033[m\033[38;5;2m"$(( `sed -nu "s/MemFree:[\t ]\+\([0-9]\+\) kB/\1/p" /proc/meminfo`/1024))"\033[38;5;22m/"$((`sed -nu "s/MemTotal:[\t ]\+\([0-9]\+\) kB/\1/Ip" /proc/meminfo`/1024 ))MB"\t\033[m\033[38;5;55m$(< /proc/loadavg)\033[m"'
 PS1='\[\e[m\n\e[1;30m\][$$:$PPID \j:\!\[\e[1;30m\]]\[\e[0;36m\] \T \d \[\e[1;30m\][\[\e[1;34m\]\u@\H\[\e[1;30m\]:\[\e[0;37m\]${SSH_TTY} \[\e[0;32m\]+${SHLVL}\[\e[1;30m\]] \[\e[1;37m\]\w\[\e[0;37m\] \n($SHLVL:\!)\$ '

List of colors for prompt and Bash

Add this to your Bash file(s) to define colors for prompt and commands:

txtblk='\e[0;30m' # Black - Regular
txtred='\e[0;31m' # Red
txtgrn='\e[0;32m' # Green
txtylw='\e[0;33m' # Yellow
txtblu='\e[0;34m' # Blue
txtpur='\e[0;35m' # Purple
txtcyn='\e[0;36m' # Cyan
txtwht='\e[0;37m' # White
bldblk='\e[1;30m' # Black - Bold
bldred='\e[1;31m' # Red
bldgrn='\e[1;32m' # Green
bldylw='\e[1;33m' # Yellow
bldblu='\e[1;34m' # Blue
bldpur='\e[1;35m' # Purple
bldcyn='\e[1;36m' # Cyan
bldwht='\e[1;37m' # White
unkblk='\e[4;30m' # Black - Underline
undred='\e[4;31m' # Red
undgrn='\e[4;32m' # Green
undylw='\e[4;33m' # Yellow
undblu='\e[4;34m' # Blue
undpur='\e[4;35m' # Purple
undcyn='\e[4;36m' # Cyan
undwht='\e[4;37m' # White
bakblk='\e[40m'   # Black - Background
bakred='\e[41m'   # Red
bakgrn='\e[42m'   # Green
bakylw='\e[43m'   # Yellow
bakblu='\e[44m'   # Blue
bakpur='\e[45m'   # Purple
bakcyn='\e[46m'   # Cyan
bakwht='\e[47m'   # White
txtrst='\e[0m'    # Text Reset

Or if you prefer color names you will know how to spell without a special decoder ring and want high intensity colors:

# Reset
Color_Off='\e[0m'       # Text Reset

# Regular Colors
Black='\e[0;30m'        # Black
Red='\e[0;31m'          # Red
Green='\e[0;32m'        # Green
Yellow='\e[0;33m'       # Yellow
Blue='\e[0;34m'         # Blue
Purple='\e[0;35m'       # Purple
Cyan='\e[0;36m'         # Cyan
White='\e[0;37m'        # White

# Bold
BBlack='\e[1;30m'       # Black
BRed='\e[1;31m'         # Red
BGreen='\e[1;32m'       # Green
BYellow='\e[1;33m'      # Yellow
BBlue='\e[1;34m'        # Blue
BPurple='\e[1;35m'      # Purple
BCyan='\e[1;36m'        # Cyan
BWhite='\e[1;37m'       # White

# Underline
UBlack='\e[4;30m'       # Black
URed='\e[4;31m'         # Red
UGreen='\e[4;32m'       # Green
UYellow='\e[4;33m'      # Yellow
UBlue='\e[4;34m'        # Blue
UPurple='\e[4;35m'      # Purple
UCyan='\e[4;36m'        # Cyan
UWhite='\e[4;37m'       # White

# Background
On_Black='\e[40m'       # Black
On_Red='\e[41m'         # Red
On_Green='\e[42m'       # Green
On_Yellow='\e[43m'      # Yellow
On_Blue='\e[44m'        # Blue
On_Purple='\e[45m'      # Purple
On_Cyan='\e[46m'        # Cyan
On_White='\e[47m'       # White

# High Intensity
IBlack='\e[0;90m'       # Black
IRed='\e[0;91m'         # Red
IGreen='\e[0;92m'       # Green
IYellow='\e[0;93m'      # Yellow
IBlue='\e[0;94m'        # Blue
IPurple='\e[0;95m'      # Purple
ICyan='\e[0;96m'        # Cyan
IWhite='\e[0;97m'       # White

# Bold High Intensity
BIBlack='\e[1;90m'      # Black
BIRed='\e[1;91m'        # Red
BIGreen='\e[1;92m'      # Green
BIYellow='\e[1;93m'     # Yellow
BIBlue='\e[1;94m'       # Blue
BIPurple='\e[1;95m'     # Purple
BICyan='\e[1;96m'       # Cyan
BIWhite='\e[1;97m'      # White

# High Intensity backgrounds
On_IBlack='\e[0;100m'   # Black
On_IRed='\e[0;101m'     # Red
On_IGreen='\e[0;102m'   # Green
On_IYellow='\e[0;103m'  # Yellow
On_IBlue='\e[0;104m'    # Blue
On_IPurple='\e[10;95m'  # Purple
On_ICyan='\e[0;106m'    # Cyan
On_IWhite='\e[0;107m'   # White

To use in commands from your shell environment:

$ echo -e "${txtblu}test"
$ echo -e "${bldblu}test"
$ echo -e "${undblu}test"
$ echo -e "${bakblu}test"

To use in a prompt (note double quotes to enable $color variable expansion and \[ \] escapes around them so they are not counted as character positions and the cursor position is not wrong):

PS1="\[$txtblu\]foo\[$txtred\] bar\[$txtrst\] baz : "

If you experience premature line wrapping when entering commands at the prompt then missing escapes is most likely to be the reason.

Prompt escapes

The various Bash prompt escapes listed in the manpage:

Bash allows these prompt strings to be customized by inserting a
number of backslash-escaped special characters that are
decoded as follows:

  \a         an ASCII bell character (07)
  \d         the date in "Weekday Month Date" format (e.g., "Tue May 26")
  \D{format} the format is passed to strftime(3) and the result
             is inserted into the prompt string an empty format
             results in a locale-specific time representation.
             The braces are required
  \e         an ASCII escape character (033)
  \h         the hostname up to the first `.'
  \H         the hostname
  \j         the number of jobs currently managed by the shell
  \l         the basename of the shell's terminal device name
  \n         newline
  \r         carriage return
  \s         the name of the shell, the basename of $0 (the portion following
             the final slash)
  \t         the current time in 24-hour HH:MM:SS format
  \T         the current time in 12-hour HH:MM:SS format
  \@         the current time in 12-hour am/pm format
  \A         the current time in 24-hour HH:MM format
  \u         the username of the current user
  \v         the version of bash (e.g., 2.00)
  \V         the release of bash, version + patch level (e.g., 2.00.0)
  \w         the current working directory, with $HOME abbreviated with a tilde
  \W         the basename of the current working directory, with $HOME
             abbreviated with a tilde
  \!         the history number of this command
  \#         the command number of this command
  \$         if the effective UID is 0, a #, otherwise a $
  \nnn       the character corresponding to the octal number nnn
  \\         a backslash
  \[         begin a sequence of non-printing characters, which could be used
             to embed a terminal control sequence into the prompt
  \]         end a sequence of non-printing characters
  The command number and the history number are usually different:
  the history number of a command is its position in the history
  list, which may include commands restored from the history file
  (see HISTORY below), while the command number is the position in
  the sequence of commands executed during the current shell session.
  After the string is decoded, it is expanded via parameter
  expansion, command substitution, arithmetic expansion, and quote
  removal, subject to the value of the promptvars shell option (see
  the description of the shopt command under SHELL BUILTIN COMMANDS

Positioning the cursor

The following sequence sets the cursor position:


The current cursor position can be saved using:


To restore a position, use the following sequence:


The following example uses these sequences to display the time in the upper right corner:

PS1=">\[\033[s\]\[\033[1;\$((COLUMNS-4))f\]\$(date +%H:%M)\[\033[u\]"

The environment variable COLUMNS contains the number of columns of the terminal. The above example substracts 4 from its value in order to justify the five character wide output of date at the right border.

Return value visualisation

Warning: Changing your prompt as described below is buggy on some terminals. You can avoid the bugs by adding a newline \n after the return value symbols.

Add this line if you want to see the return value of the last executed command.

PROMPT_COMMAND='RET=$?; if [[ $RET -eq 0 ]]; then echo -ne "\033[0;32m$RET\033[0m ;)"; else echo -ne "\033[0;31m$RET\033[0m ;("; fi; echo -n " "'

It will look like this:

0 ;) harvie@harvie-ntb ~/ $ true
0 ;) harvie@harvie-ntb ~/ $ false
1 ;( harvie@harvie-ntb ~/ $ 

Zero is green and non-zero is red. There is also the smiley indication (replace it with anything you want); so your prompt will smile if the last operation was successful.

Because terminal emulators like rxvt-unicode use the variable PROMPT_COMMAND to set their window title, it must be altered further when using such terminal.

 printf "\033]0;%s@%s:%s\007" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}" 

Append the above string to the PROMPT_COMMAND='...' line, and the window title will show user@hostname: /working/directory as intended.

Advanced return value visualisation

If you want colors, you need to set $RED and $GREEN values:


You have to specify these values in Bash's configuration files:

#return value visualisation
RET_VALUE='$(echo $RET)' #Ret value not colorized - you can modify it.
RET_SMILEY='$(if [[ $RET = 0 ]]; then echo -ne "\[$GREEN\];)"; else echo -ne "\[$RED\];("; fi;)'

Then you can use $RET_VALUE and $RET_SMILEY variables in the prompt. Note that you need use double quotes:


This will give you basic prompt:

0 ;) : true
0 ;) : false
1 ;( : 

But you will probably want to use $RET_VALUE or $RET_SMILEY in your own prompt, like this:

PS1="\[$WHITE\]$RET_VALUE $RET_SMILEY \[$BLUE\]\u\[$RED\]@\[$EBLUE\]\h\[$WHITE\] \W \[$ERED\]\\$\[$EWHITE\] "

Here's an alternative that only include the error status if it is nonzero:

PROMPT_COMMAND='es=$?; [[ $es -eq 0 ]] && unset error || error=$(echo -e "\e[1;41m $es \e[40m")'
PS1="${error} ${PS1}"


After reading through most of the Bash Prompt Howto, the author developed a color bash prompt that displays the last 25 characters of the current working directory. This prompt should work well on terminals with a black background. The following code goes in file ~/.bashrc.

  • Add the bash_prompt_command function. If you have a couple directories with long names or start entering a lot of subdirectories, this function will keep the command prompt from wrapping around the screen by displaying at most the last pwdmaxlen characters from the PWD. This code was taken from the Bash Prompt Howto's section on Controlling the Size and Appearance of $PWD and modified to replace the user's home directory with a tilde.
# Fancy PWD display function
# The home directory (HOME) is replaced with a ~
# The last pwdmaxlen characters of the PWD are displayed
# Leading partial directory names are striped off
# /home/me/stuff          -> ~/stuff               if USER=me
# /usr/share/big_dir_name -> ../share/big_dir_name if pwdmaxlen=20
bash_prompt_command() {
    # How many characters of the $PWD should be kept
    local pwdmaxlen=25
    # Indicate that there has been dir truncation
    local trunc_symbol=".."
    local dir=${PWD##*/}
    pwdmaxlen=$(( ( pwdmaxlen < ${#dir} ) ? ${#dir} : pwdmaxlen ))
    local pwdoffset=$(( ${#NEW_PWD} - pwdmaxlen ))
    if [ ${pwdoffset} -gt "0" ]
  • The next fragment generates the command prompt and various colors are defined. The user's color for the username, hostname, and prompt ($ or #) is set to cyan, and if the user is root (root's UID is always 0), set the color to red. The command prompt is set to a colored version of Arch's default with the NEW_PWD from the last function.
Also, make sure that your color variables are enclosed in double and not single quote marks. Using single quote marks seems to give Bash problems with line wrapping correctly.
bash_prompt() {
    case $TERM in
         local TITLEBAR='\[\033]0;\u:${NEW_PWD}\007\]'
         local TITLEBAR=""
    local NONE="\[\033[0m\]"    # unsets color to term's fg color
    # regular colors
    local K="\[\033[0;30m\]"    # black
    local R="\[\033[0;31m\]"    # red
    local G="\[\033[0;32m\]"    # green
    local Y="\[\033[0;33m\]"    # yellow
    local B="\[\033[0;34m\]"    # blue
    local M="\[\033[0;35m\]"    # magenta
    local C="\[\033[0;36m\]"    # cyan
    local W="\[\033[0;37m\]"    # white
    # emphasized (bolded) colors
    local EMK="\[\033[1;30m\]"
    local EMR="\[\033[1;31m\]"
    local EMG="\[\033[1;32m\]"
    local EMY="\[\033[1;33m\]"
    local EMB="\[\033[1;34m\]"
    local EMM="\[\033[1;35m\]"
    local EMC="\[\033[1;36m\]"
    local EMW="\[\033[1;37m\]"
    # background colors
    local BGK="\[\033[40m\]"
    local BGR="\[\033[41m\]"
    local BGG="\[\033[42m\]"
    local BGY="\[\033[43m\]"
    local BGB="\[\033[44m\]"
    local BGM="\[\033[45m\]"
    local BGC="\[\033[46m\]"
    local BGW="\[\033[47m\]"
    local UC=$W                 # user's color
    [ $UID -eq "0" ] && UC=$R   # root's color
    PS1="$TITLEBAR ${EMK}[${UC}\u${EMK}@${UC}\h ${EMB}\${NEW_PWD}${EMK}]${UC}\\$ ${NONE}"
    # without colors: PS1="[\u@\h \${NEW_PWD}]\\$ "
    # extra backslash in front of \$ to make bash colorize the prompt
  • Finally, append this code. This ensures that the NEW_PWD variable will be updated when you cd somewhere else, and it sets the PS1 variable, which contains the command prompt.
unset bash_prompt


These prompts offer a little more flash and visual clarity. Note that the use of red in the root user's prompt should provide ample warning. That is not to say someone could not use flashing text or arrow to do even more, but these will give you a good starting point.

First, change the default background in your terminal preferences (this example uses Xfce's Terminal program) to #D2D2D2, and the text color to #000000. The font is listed as DejaVu Sans Mono Book 12. The cursor color is #00AA00, and the tab activity color is #AF0000.

Second, in ~/.bashrc and right after the PS1= line, enter a new line with the following:

PS1='\e[1;33;47m\u \e[1;32;47mon \h \e[1;35;47m\d \@\e[0;0m\n\e[1;34m[dir.= \w] \# > \e[0;0m'

And then place a # in front of the first PS1 line to remark it out.

Third, for root user, edit /root/.bashrc in the same manner to include:

PS1='\e[1;31;47m\u \e[1;32;47mon \h \e[1;35;47m\d \@\e[0;0m\n\e[1;31m[dir.= \w] \# > \e[0;0m'

Do not forget to comment out the old line.

These are double-line prompts, and they should look something like these:


Username on myhost Sun Jan 15 12:30 PM     
[dir.= /home/username] 1 >                 


Root on myhost  Sun Jan 15 12:30 PM           
[dir.= /etc/rc.d] 1 >                      

You will note that the background colors make them easier to read, and the text colors just keep things interesting. There is a lot of leeway to make them personalized, just with the use of colors. Enjoy!

Set window title

Xterm and many other terminal emulators (including PuTTY) allow you to set the window title using special escape sequences. You can define the ${XTERM_TITLE} variable as follows, then insert it at the beginning of the prompt to set xterm title (if available) to directory@user@hostname:

#set xterm title
case "$TERM" in
  xterm | xterm-color)

The text between 0; and \a can be set to anything you like, for example:

export PS1='\[\e]0;Welcome to ArchLinux\a\]\$>> '

sets the window title to "Welcome to ArchLinux" and displays this simple prompt:

$>> _

Different colors for text entry and console output

If you do not reset the text color at the end of your prompt, both the text you enter and the console text will simply stay in that color. If you want to edit text in a special color but still use the default color for command output, you will need to reset the color after you press enter, but still before any commands get run. You can do this by installing a DEBUG trap in your ~/.bashrc, like this:

trap 'echo -ne "\e[0m"' DEBUG

Generalizing colors for all users

If you want to generalize the use of colors for all users in the system, you must remove your ~/.bashrc file, modify the /etc/bash.bashrc file and create a /etc/DIR_COLORS file. Here is our possible generalization of the Gentoo color scheme (with some additions) for Arch linux:


# /etc/bash.bashrc
# https://wiki.archlinux.org/index.php/Color_Bash_Prompt
# This file is sourced by all *interactive* bash shells on startup,
# including some apparently interactive shells such as scp and rcp
# that can't tolerate any output.  So make sure this doesn't display
# anything or bad things will happen !

# Test for an interactive shell.  There is no need to set anything
# past this point for scp and rcp, and it's important to refrain from
# outputting anything in those cases.

if [[ $- != *i* ]] ; then
	# Shell is non-interactive.  Be done now!

# Bash won't get SIGWINCH if another process is in the foreground.
# Enable checkwinsize so that bash will check the terminal size when
# it regains control.  #65623
# http://cnswww.cns.cwru.edu/~chet/bash/FAQ (E11)
shopt -s checkwinsize

# Enable history appending instead of overwriting.  #139609
shopt -s histappend

case ${TERM} in
    PROMPT_COMMAND=${PROMPT_COMMAND:+$PROMPT_COMMAND; }'printf "\033]0;%s@%s:%s\007" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}"'
    PROMPT_COMMAND=${PROMPT_COMMAND:+$PROMPT_COMMAND; }'printf "\033_%s@%s:%s\033\\" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}"'

# fortune is a simple program that displays a pseudorandom message
# from a database of quotations at logon and/or logout.
# Type: "pacman -S fortune-mod" to install it, then uncomment the
# following lines:

if [ "$PS1" ]; then

# Set colorful PS1 only on colorful terminals.
# dircolors --print-database uses its own built-in database
# instead of using /etc/DIR_COLORS.  Try to use the external file
# first to take advantage of user additions.  Use internal bash
# globbing instead of external grep binary.

# Dynamically modified variables. Do not change them!
# sanitize TERM:

[[ -f ~/.dir_colors   ]] && match_lhs="${match_lhs}$(<~/.dir_colors)"
[[ -f /etc/DIR_COLORS ]] && match_lhs="${match_lhs}$(</etc/DIR_COLORS)"
[[ -z ${match_lhs}    ]] \
	&& type -P dircolors >/dev/null \
	&& match_lhs=$(dircolors --print-database)
[[ $'\n'${match_lhs} == *$'\n'"TERM "${safe_term}* ]] && use_color=true

if ${use_color} ; then

	sadness='$([[ $? != 0 ]] && echo -ne "\033[01;31m:-(\033[00m ";)'

	# Enable colors for ls, etc.  Prefer ~/.dir_colors #64489
	if type -P dircolors >/dev/null ; then
		if [[ -f ~/.dir_colors ]] ; then
			eval $(dircolors -b ~/.dir_colors)
		elif [[ -f /etc/DIR_COLORS ]] ; then
			eval $(dircolors -b /etc/DIR_COLORS)

	if [[ ${EUID} == 0 ]] ; then
		PS1="\[\033[01;31m\]\h\[\033[01;34m\] \W $sadness\$\[\033[00m\] "
		PS1="\[\033[01;32m\]\u@\h\[\033[01;34m\] \w $sadness\$\[\033[00m\] "

	alias ls="ls --color=auto"
	alias dir="dir --color=auto"
	alias grep="grep --colour=auto"


	sadness='$([[ $? != 0 ]] && echo ":-( ";)'

	if [[ ${EUID} == 0 ]] ; then
		# show root@ when we do not have colors
		PS1="\u@\h \W $sadness\$ "
		PS1="\u@\h \w $sadness\$ "


PS2="> "
PS3="> "
PS4="+ "

# Try to keep environment pollution down, EPA loves us.
unset use_color safe_term match_lhs sadness

# Try to enable the auto-completion.
[ -r /usr/share/bash-completion/bash_completion   ] && . /usr/share/bash-completion/bash_completion

# Try to enable the "Command not found" hook.
[ -r /usr/share/doc/pkgfile/command-not-found.bash ] && . /usr/share/doc/pkgfile/command-not-found.bash


# Configuration file for the color ls utility
# This file goes in the /etc directory, and must be world readable.
# You can copy this file to .dir_colors in your $HOME directory to override
# the system defaults.

# COLOR needs one of these arguments: 'tty' colorizes output to ttys, but not
# pipes. 'all' adds color characters to all output. 'none' shuts colorization
# off.

# Extra command line options for ls go here.
# Basically these ones are:
#  -F = show '/' for dirs, '*' for executables, etc.
#  -T 0 = don't trust tab spacing when formatting ls output.

# Below, there should be one TERM entry for each termtype that is colorizable
TERM linux
TERM console
TERM con132x25
TERM con132x30
TERM con132x43
TERM con132x60
TERM con80x25
TERM con80x28
TERM con80x30
TERM con80x43
TERM con80x50
TERM con80x60
TERM xterm
TERM vt100
TERM rxvt
TERM rxvt-256color
TERM rxvt-cygwin
TERM rxvt-cygwin-native
TERM rxvt-unicode
TERM rxvt-unicode-256color
TERM rxvt-unicode256

# EIGHTBIT, followed by '1' for on, '0' for off. (8-bit output)

# Below are the color init strings for the basic file types. A color init
# string consists of one or more of the following numeric codes:
# Attribute codes: 
# 00=none 01=bold 04=underscore 05=blink 07=reverse 08=concealed
# Text color codes:
# 30=black 31=red 32=green 33=yellow 34=blue 35=magenta 36=cyan 37=white
# Background color codes:
# 40=black 41=red 42=green 43=yellow 44=blue 45=magenta 46=cyan 47=white
NORMAL 00	# global default, although everything should be something.
FILE 00 	# normal file
DIR 01;34 	# directory
LINK 01;36 	# symbolic link
FIFO 40;33	# pipe
SOCK 01;35	# socket
BLK 40;33;01	# block device driver
CHR 40;33;01 	# character device driver

# This is for files with execute permission:
EXEC 01;32 

# List any file extensions like '.gz' or '.tar' that you would like ls
# to colorize below. Put the extension, a space, and the color init string.
# (and any comments you want to add after a '#')
.cmd 01;32 # executables (bright green)
.exe 01;32
.com 01;32
.btm 01;32
.bat 01;32
.tar 01;31 # archives or compressed (bright red)
.tgz 01;31
.arj 01;31
.taz 01;31
.lzh 01;31
.zip 01;31
.z   01;31
.Z   01;31
.gz  01;31
.jpg 01;35 # image formats
.gif 01;35
.bmp 01;35
.xbm 01;35
.xpm 01;35
.tif 01;35

Example of cohabitation of /etc/bash.bashrc and ~/.bashrc

~/.bashrc and /etc/bash.bashrc can also cohabitate. Here is a possible example of a typical Arch user's ~/.bashrc file which cohabits with our Gentoo-like /etc/bash.bashrc file valid for all users. The output will remain coloured.

# ~/.bashrc

# If not running interactively, don't do anything
[[ $- != *i* ]] && return

# pacman/yaourt aliases
alias pac="sudo /usr/bin/pacman -S"	# default action	- install one or more packages
alias paca="/usr/bin/yaourt -S"		# default yaourt action	- install one or more packages including AUR
alias pacu="/usr/bin/yaourt -Syua"	# '[u]pdate'		- upgrade all packages to their newest version
alias pacr="sudo /usr/bin/pacman -Rs"	# '[r]emove'		- uninstall one or more packages
alias pacs="/usr/bin/pacman -Ss"	# '[s]earch'		- search for a package using one or more keywords
alias pacys="/usr/bin/yaourt -Ss"	# '[y]aourt [s]earch'	- search for a package or a PKGBUILD using one or more keywords
alias paci="/usr/bin/yaourt -Si"	# '[i]nfo'		- show information about a package
alias paclo="/usr/bin/pacman -Qdt"	# '[l]ist [o]rphans'	- list all packages which are orphaned
alias pacc="sudo /usr/bin/pacman -Scc"	# '[c]lean cache'	- delete all not currently installed package files
alias paclf="/usr/bin/pacman -Ql"	# '[f]iles'		- list all files installed by a given package

Random quotations at logon

If you want a random quotation at logon (like Slackware) you must install Fortune. Fortune is a simple program that displays a pseudorandom message from a database of quotations at logon and/or logout. Type pacman -S fortune-mod to install it, then uncomment the following lines from our Gentoo-like /etc/bash.bashrc file:

# if [ "$PS1" ]; then
#	/usr/bin/fortune
# fi

If you want to colorize (brown in this example) the random message from fortune, replace the previous commented text with:

 if [ "$PS1" ]; then
	echo -e "\e[00;33m$(/usr/bin/fortune)\e[00m"

Colorized Arch Latest news at logon

If you want to read the latest news from the Arch Official Website, instead of a random quotation from fortune, replace the following lines from our Gentoo-like /etc/bash.bashrc file:

# if [ "$PS1" ]; then
#	/usr/bin/fortune
# fi


if [ "$PS1" ]; then
	# The characters "£, §" are used as metacharacters. They should not be encountered in a feed...
	echo -e "$(echo $(curl --silent https://www.archlinux.org/feeds/news/ | sed -e ':a;N;$!ba;s/\n/ /g') | \
		sed -e 's/&amp;/\&/g
		s/<title>/\\n\\n\\n   :: \\e[01;31m/g; s/<\/title>/\\e[00m ::\\n/g
		s/<link>/ [ \\e[01;36m/g; s/<\/link>/\\e[00m ]/g
		s/<description>/\\n\\n\\e[00;37m/g; s/<\/description>/\\e[00m\\n\\n/g
		s/<p\( [^>]*\)\?>\|<br\s*\/\?>/\n/g
		s/<b\( [^>]*\)\?>\|<strong\( [^>]*\)\?>/\\e[01;30m/g; s/<\/b>\|<\/strong>/\\e[00;37m/g
		s/<i\( [^>]*\)\?>\|<em\( [^>]*\)\?>/\\e[41;37m/g; s/<\/i>\|<\/em>/\\e[00;37m/g
		s/<u\( [^>]*\)\?>/\\e[4;37m/g; s/<\/u>/\\e[00;37m/g
		s/<code\( [^>]*\)\?>/\\e[00m/g; s/<\/code>/\\e[00;37m/g
		s/<a[^§]*§\([^\"]*\)\"[^>]*>\([^£]*\)[^£]*£/\\e[01;31m\2\\e[00;37m \\e[01;34m[\\e[00;37m \\e[04m\1\\e[00;37m\\e[01;34m ]\\e[00;37m/g
		s/<li\( [^>]*\)\?>/\n \\e[01;34m*\\e[00;37m /g
		s/ *<[^>]\+> */ /g

that is a small and coloured RSS escaping script written by the user grufo. See this thread for details.

Restoring the original /etc/bash.bashrc file

If you repent having modified the /etc/bash.bashrc file, you can always restore the original Arch /etc/bash.bashrc file and remove the /etc/DIR_COLORS file. Note that there is not an "official" bash.bashrc: each distribution has its own. Here is the exact copy of the Arch original /etc/bash.bashrc file.


# /etc/bash.bashrc

# If not running interactively, don't do anything
[[ $- != *i* ]] && return

PS1='[\u@\h \W]\$ '
PS2='> '
PS3='> '
PS4='+ '

case ${TERM} in
    PROMPT_COMMAND=${PROMPT_COMMAND:+$PROMPT_COMMAND; }'printf "\033]0;%s@%s:%s\007" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}"'
    PROMPT_COMMAND=${PROMPT_COMMAND:+$PROMPT_COMMAND; }'printf "\033_%s@%s:%s\033\\" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}"'

[ -r /usr/share/bash-completion/bash_completion   ] && . /usr/share/bash-completion/bash_completion

Original /etc/bash.bashrc from Gentoo

The original not modified Gentoo's /etc/bash.bashrc file can be found here.

See also

External links