Pewarnaan pada Bash


Sesuai dengan environment alARM (archlinux ARM) yang ada pada penulis hanya berupa konsol yang diakses lewat ssh begitu hitam pekat, dibuatlah dekorasi yang nian cantik rupawan. Dimulai dari mewarnai dan dekorasi pada bash prompt yang lebih informatif, hingga hadirnya tokoh-tokoh yang tidak terpikirkan sebelumnya setiap kali masuk ke dalam sistem.

Langkah awal, backup /etc/bash.bashrc dan gantikan dengan script berikut

# /etc/bash.bashrc
# 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 not running interactively, don't do anything!
[[ $- != *i* ]] && return

# 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.
# (E11)
shopt -s checkwinsize

# Enable history appending instead of overwriting.
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.
# If you wish to use it, please install "fortune-mod" from the
# official repositories, then uncomment the following line:

# [[ "$PS1" ]] && /usr/bin/fortune

# 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.

# sanitize TERM:

[[ -f ~/.dir_colors ]] && match_lhs="${match_lhs}$(<~/.dir_colors)"
[[ -f /etc/DIR_COLORS ]] && match_lhs="${match_lhs}$(/dev/null \
	&& match_lhs=$(dircolors --print-database)

if [[ $'\n'${match_lhs} == *$'\n'"TERM "${safe_term}* ]] ; then

	# we have colors :-)

	# Enable colors for ls, etc. Prefer ~/.dir_colors
	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)

	PS1="$(if [[ ${EUID} == 0 ]]; then echo '\[\033[01;31m\]\h'; else echo '\[\033[01;32m\]\u@\h'; fi)\[\033[01;34m\] \w \$([[ \$? != 0 ]] && echo \"\[\033[01;31m\]:(\[\033[01;34m\] \")\\$\[\033[00m\] "

	# Use this other PS1 string if you want \W for root and \w for all other users:
	# PS1="$(if [[ ${EUID} == 0 ]]; then echo '\[\033[01;31m\]\h\[\033[01;34m\] \W'; else echo '\[\033[01;32m\]\u@\h\[\033[01;34m\] \w'; fi) \$([[ \$? != 0 ]] && echo \"\[\033[01;31m\]:(\[\033[01;34m\] \")\\$\[\033[00m\] "

	alias ls="ls --color=auto"
	alias dir="dir --color=auto"
	alias grep="grep --color=auto"
	alias dmesg='dmesg --color'

	# Uncomment the "Color" line in /etc/pacman.conf instead of uncommenting the following line...!

	# alias pacman="pacman --color=auto"


	# show root@ when we do not have colors

	PS1="\u@\h \w \$([[ \$? != 0 ]] && echo \":( \")\$ "

	# Use this other PS1 string if you want \W for root and \w for all other users:
	# PS1="\u@\h $(if [[ ${EUID} == 0 ]]; then echo '\W'; else echo '\w'; fi) \$([[ \$? != 0 ]] && echo \":( \")\$ "


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

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

# Try to enable the auto-completion (type: "pacman -S bash-completion" to install it).
[ -r /usr/share/bash-completion/bash_completion ] && . /usr/share/bash-completion/bash_completion

# Try to enable the "Command not found" hook ("pacman -S pkgfile" to install it).
# See also:
[ -r /usr/share/doc/pkgfile/command-not-found.bash ] && . /usr/share/doc/pkgfile/command-not-found.bash

buat file /etc/DIR_COLORS dengan isi sebagai berikut

# 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 xterm-color
TERM vt100
TERM rxvt
TERM rxvt-256color
TERM rxvt-cygwin
TERM rxvt-cygwin-native
TERM rxvt-unicode
TERM rxvt-unicode-256color
TERM rxvt-unicode256
TERM screen

# 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

Pada file /etc/pacman.conf, hapus tanda ‘#’ pada bais #Color. Sedangkan pada file .bashrc beri tanda ‘#’ pada PS1='[\u@\h \W]\$ ' untuk memberi comment.

Sampai tahap ini konsol akan memberikan sentuhan warna yang menyegarkan dimata. Sedikit perubahan pada PS1 agar menampilkan branch git pada folder git, dengan catatan package git sudah di instal.

PS1="$(if [[ ${EUID} == 0 ]]; then echo '\[\033[01;31m\]\h'; else echo '\[\033[01;32m\]\u\[\033[00m\]@\[\033[01;34m\]\h'; fi) \[\033[00m\]\w\$([[ \$? != 0 ]] && echo \" \[\033[01;31m\]:(\[\033[01;34m\]\")\[\033[01;33m\]\$(__git_ps1)\n\[\033[01;34m\]\$\[\033[00m\] "

Selanjutnya, hadirkan karakter-karakter lucu setiap masuk bash. Install paket sudo pacman -S cowsay fortune dan tambahkan baris berikut pada /etc/bash.bashrc dibawah baris #[[ "$PS1" ]] && /usr/bin/fortune

command fortune -a | fmt -80 -s | $(shuf -n 1 -e cowsay cowthink) -$(shuf -n 1 -e b d g p s t w y) -f $(shuf -n 1 -e $(cowsay -l | tail -n +2)) -n

Simpan dan coba login ke bash. Selanjutnya cobalah bereksperimen dengan ponysay.


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