~/.zshrc: Why? Convenience.

Better completion out of the box, fancier & better prompt.

.zshrc

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# The following lines were added by compinstall
zstyle ':completion:*' completer _complete _ignored
zstyle ':completion:*' matcher-list 'm:{[:lower:]}={[:upper:]}' 'r:|[._-/]=** r:|=**'
zstyle :compinstall filename '/home/lu/.zshrc'
autoload -Uz compinit
compinit
# End of lines added by compinstall
# Lines configured by zsh-newuser-install
HISTFILE=~/.zsh_history
HISTSIZE=10000
SAVEHIST=1000
setopt autocd extendedglob
# End of lines configured by zsh-newuser-install
function repo_char {
	#hg root >/dev/null 2> /dev/null && echo '☿' && return
	git branch > /dev/null 2> /dev/null && echo "±" && return
	echo "∅"
}
function repo_branch {
	if git branch > /dev/null 2> /dev/null; then
		echo "%{$fg[green]%}$(git branch --no-color | sed -En 's/^\* (.*)/\1/p')%{$reset_color%}"
	fi
}
autoload colors && colors
function precmd {
	user="%{$fg[red]%}%n%{$reset_color%}"
	dir="%{$fg[cyan]%}%~%{$reset_color%}"
	lastcmd="$history[$(($HISTCMD-1))]"
	lastcmd_witherror="%(?.$lastcmd.%S$lastcmd%s)"
	PROMPT="$user in $dir@$(repo_branch) $lastcmd_witherror
$(repo_char) $ "
	RPROMPT="%D{%Y-%m-%d} %{$fg[red]%}%t%{$reset_color%}"
}
bindkey $terminfo[kend]  end-of-line
bindkey $terminfo[khome] beginning-of-line
bindkey $terminfo[kdch1] delete-char
bindkey  history-incremental-search-backward