Ars Asks: Share your shell and show us your tricked-out terminals!

color_prompt=yes

if [ "$color_prompt" = yes ]; then

function timer_now_us {
    local seconds=${EPOCHREALTIME%.*}
    local micros=${EPOCHREALTIME#*.}
    micros="${micros}000000"
    REPLY="${seconds}${micros:0:6}"
}

function timer_stop {
    if [[ ${timer_command_active:-0} -ne 1 ]] || [[ -z ${timer_started_at_us:-} ]]; then
        timer_show=0us
        return
    fi

    timer_now_us
    local delta_us=$((REPLY - timer_started_at_us))
    local us=$((delta_us % 1000))
    local ms=$(((delta_us / 1000) % 1000))
    local s=$(((delta_us / 1000000) % 60))
    local m=$(((delta_us / 60000000) % 60))
    local h=$((delta_us / 3600000000))
    # 总是显示三位精度
    if ((h > 0)); then timer_show=${h}h${m}m
    elif ((m > 0)); then timer_show=${m}m${s}s
    elif ((s >= 10)); then timer_show=${s}.$((ms / 100))s
    elif ((s > 0)); then timer_show=${s}.$(printf %03d $ms)s
    elif ((ms >= 100)); then timer_show=${ms}ms
    elif ((ms > 0)); then timer_show=${ms}.$((us / 100))ms
    else timer_show=${us}us
    fi

    unset timer_started_at_us
    timer_command_active=0
}

# 提示符及提示符颜色
function set_prompt {
  local Last_Command=${1:-$?}
  FancyX='\342\234\227'
  Checkmark='\342\234\223'
  export PS1="\n$WHITE[\t] "
  if [[ $Last_Command == 0 ]]; then
  	PS1+="\$? $GREEN$Checkmark "
  else
  	PS1+="\$? $RED$FancyX "
  fi
  timer_stop
  PS1+="$WHITE($timer_show)"
  PS1+="\n\[$HOSTCOLOR\]\u@\h\[\033[00m\]:\[\033[1;38;5;027m\]\w\[\033[00m\] \\$ "
}

function timer_prompt_command {
  local last_command=${1:-$?}
  set_prompt "$last_command"
}

PS0='${ timer_now_us; timer_started_at_us=$REPLY; timer_command_active=1; }'
PROMPT_COMMAND='timer_prompt_command'

fi

function fish_prompt --description '写出提示符'
    # 保存上一个状态
    set -l last_status $status

    # 如果可用，计算命令持续时间
    set -l cmd_duration ""
    if set -q CMD_DURATION
        # 将毫秒转换为微秒以进行更精确的比较
        set -l duration_us (math "$CMD_DURATION * 1000")

        # 计算不同的时间单位
        set -l us (math "$duration_us % 1000")
        set -l ms (math "floor($duration_us / 1000) % 1000")
        set -l s (math "floor($duration_us / 1000000) % 60")
        set -l m (math "floor($duration_us / 60000000) % 60")
        set -l h (math "floor($duration_us / 3600000000)")

        # 格式化持续时间字符串
        if test $h -gt 0
            set cmd_duration (string join '' "(" $h "h" $m "m)")
        else if test $m -gt 0
            set cmd_duration (string join '' "(" $m "m" $s "s)")
        else if test $s -ge 10
            set -l fraction (math "floor($ms / 100)")
            set cmd_duration (string join '' "(" $s "." $fraction "s)")
        else if test $s -gt 0
            set cmd_duration (string join '' "(" $s "." (printf "%03d" $ms) "s)")
        else if test $ms -ge 100
            set cmd_duration (string join '' "(" $ms "ms)")
        else if test $ms -gt 0
            set -l fraction (math "floor($us / 100)")
            set cmd_duration (string join '' "(" $ms "." $fraction "ms)")
        else
            set cmd_duration (string join '' "(" $us "us)")
        end
    end

    # 定义状态的unicode符号
    set -l checkmark "✓"
    set -l cross "✗"

## 一抹色彩

在我成长的岁月里，我沉浸在 ANSI BBS 图形中，这可能让我比一般的沉闷、拘谨的管理员更喜欢终端中的彩色文本。我知道有些人认为语法高亮和颜色会 [损害理解并鼓励略读](https://www.linusakesson.net/programming/syntaxhighlighting/)，但我说什么呢？我喜欢它们，并依赖它们。也许我略读得太多了，但就这样吧。你可以从我冰冷的尸体上夺走我的彩色壳工具。

为此，我依靠一个小程序 GRC（用于 [通用着色器](https://github.com/garabik/grc)）来为其他工具添加高亮和着色。它广泛可用且无需任何额外配置即可工作。

![图 4：显示使用 ip a 和 ping 前后效果的图片](https://cdn.arstechnica.net/wp-content/uploads/2026/04/shelltrix_grc2-1024x635.png)
[查看大图](https://cdn.arstechnica.net/wp-content/uploads/2026/04/shelltrix_grc2.png)

有一些别名（我像一个好公民一样将其保留在 `.bash_aliases` 中），使一些常用命令的彩色输出成为默认：

我也很喜欢让数字更易于人类阅读，因此 `-h` 开关被广泛使用。

（请注意，如果将命令（如 `ip`）包装在 GRC 中并将输出管道到其他内容，则可能会出现奇怪的情况。请谨慎使用。或者不要！这是你的电脑，随你便！）

syntax on
    set hlsearch "高亮搜索结果
    set ignorecase "搜索时忽略大小写...
    set smartcase " ...除非搜索包含混合大小写
    set gdefault "替换默认为全局
    set colorcolumn=80 "高亮第80列
    set linebreak "以单词为单位换行
    imap <silent> <Down> <C-o>gj
    imap <silent> <Up> <C-o>gk
    nmap <silent> <Down> gj
    nmap <silent> <Up> gk
    filetype plugin indent on
    set tabstop=4
    set softtabstop=4
    set shiftwidth=4
    set expandtab
    highlight MatchParen ctermbg=black guibg=black
    highlight MatchParen cterm=underline gui=underline

    set guifont=Menlo\ for\ Powerline

    " air-line
    let g:airline_powerline_fonts = 1

    if !exists('g:airline_symbols')
        let g:airline_symbols = {}
    endif

    " unicode symbols
    let g:airline_left_sep = '▶'
    let g:airline_right_sep = '◀'
    let g:airline_symbols.linenr = '␊'
    let g:airline_symbols.branch = '⎇'
    let g:airline_symbols.paste = 'ρ'
    let g:airline_symbols.whitespace = 'Ξ'

    " airline symbols
    let g:airline_left_sep = ''
    let g:airline_left_alt_sep = ''
    let g:airline_right_sep = ''
    let g:airline_right_alt_sep = ''
    let g:airline_symbols.branch = ''
    let g:airline_symbols.readonly = ''
    let g:airline_symbols.linenr = ''