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zsh

(my favourite shell)

.zshrc

PS1="%F{cyan}(%F{green}%B%n%F{cyan}@%F{green}%m%b%F{cyan})%f %\$[ \$COLUMNS - 50 ]<..<%~ %<<%B%(#.%F{red}#.%F{blue}$)%f%b "
setopt promptsubst