~ steve /.bashrc

Gives a prompt which shows user's group if it's different from username, with a $ that turns red if the previous command exited non-zero. Also defines some aliases, plus unique package management commands.
# bash-specific shrc
# vim:fdm=marker

# define useful aliases for color codes
sh_norm="\[\033[0m\]"
sh_black="\[\033[0;30m\]"
sh_darkgray="\[\033[1;30m\]"
sh_blue="\[\033[0;34m\]"
sh_light_blue="\[\033[1;34m\]"
sh_green="\[\033[0;32m\]"
sh_light_green="\[\033[1;32m\]"
sh_cyan="\[\033[0;36m\]"
sh_light_cyan="\[\033[1;36m\]"
sh_red="\[\033[0;31m\]"
sh_light_red="\[\033[1;31m\]"
sh_purple="\[\033[0;35m\]"
sh_light_purple="\[\033[1;35m\]"
sh_brown="\[\033[0;33m\]"
sh_yellow="\[\033[1;33m\]"
sh_light_gray="\[\033[0;37m\]"
sh_white="\[\033[1;37m\]"

# whether or not we have a command
have() {
        type "$1" &> /dev/null
}

# Prompt {{{

# the name of my primary (local) machine
LOCALHOST='pastorius'

if [ -z "$debian_chroot" ] && [ -r /etc/debian_chroot ]; then
        debian_chroot=`cat /etc/debian_chroot`
fi

GRP=$(groups |sed 's/ .*//')
if [ "$GRP" != "$USER" ]; then
        prompt_group=$GRP
fi

if [ $(hostname) = $LOCALHOST ]; then
        # set a green prompt for my laptop
        prompt_color=$sh_light_green
else
        # set a red prompt everywhere else
        prompt_color=$sh_light_red
fi

# user[:group]@host:dir$
PS1='${debian_chroot:+($debian_chroot)}'${prompt_color}'\u${prompt_group:+:$prompt_group}@\h'${sh_norm}':'${sh_light_blue}'\w'${sh_norm}'${ERROR_FLAG:+'${sh_light_red}'}\$${ERROR_FLAG:+'${sh_norm}'} '

# Set an error flag to be used in our prompt.
PROMPT_COMMAND='if [ $? -ne 0 ]; then ERROR_FLAG=1; else ERROR_FLAG=; fi; '

# If this is an xterm set the title to user@host:dir
case "$TERM" in
xterm*|rxvt*)
        PROMPT_COMMAND=${PROMPT_COMMAND}' echo -ne "\033]0;${USER}@${HOSTNAME}: ${PWD/$HOME/~}\007"'
        ;;
*)
        ;;
esac

# }}}

# Aliases {{{

# Color support
if [ "$TERM" != "dumb" ]; then
        eval "`dircolors -b`"
        alias ls='ls --color=auto'
        alias grep='grep --color'
fi

# Directory aliases
alias l='ls'
alias la='ls -a'
alias ll='ls -l'
alias lc='ls -lah'

# Other useful aliases
alias g='grep'
alias d='darcs'
alias s='sudo'
alias se='sudoedit'

# If we've got aptitude, define package aliases around it.
if have aptitude; then
        alias canhas='sudo aptitude install'
        alias whatz='aptitude show'
        alias wherez='aptitude search'
fi

have htop && alias top='htop'
have screen && alias scr='screen -RRd'
have screen && alias scrl='screen -ls'
have vim && alias vi='vim'

# }}}

# Local config {{{

if [ -f $HOME/local/shrc ]; then
        . $HOME/local/shrc
fi

# }}}

# Completion {{{

if [ -f /etc/bash_completion ]; then
        . /etc/bash_completion
fi

# }}}
  
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