#!/bin/sh   # cygwin-mirrors.sh # 该脚本用于查找 Cygwin 的最快镜像   timeout=5           # 超时时间 mirrors_count=5     # 显示最快的几个镜像 PROG=`basename $0`  # 程序名称   ## 显示 usage _usage() {     echo "Usage: ${PROG} [-t <timeout>] [-p <mirrors_count>] [-h]"     exit }   ## 检查参数并赋值 _assign() {     if [ "$1" == "timeout" -o "$1" == "mirrors_count" ]; then         if [[ "$2" =~ ^[[:digit:]]+$ ]]; then             let $1=$2         else             echo "$1 should be a number"             exit 1         fi     fi }   ## 处理参数 while getopts ":t:p:h-:" optval do     case "$optval" in         t)   _assign timeout ${OPTARG} ;;         p)   _assign mirrors_count ${OPTARG} ;;         h)   _usage ;;         "-") echo "Unknown option: '--${OPTARG}'" >&2;            _usage ;;         ":") echo "Option '-${OPTARG}' requires an argument" >&2; _usage ;;         "?") echo "Unknown option: '-${OPTARG}'" >&2;             _usage ;;         ## Should not occur         *)   echo "Unknown error while processing options" >&2;   _usage ;;     esac done shift $(expr ${OPTIND} - 1)   ## 检查用户是否安装了 curl CURL=`which curl 2> /dev/null` [ -z "$CURL" ] && (echo "Need to install the curl package."; exit 1)   ## 读取镜像站点 mirrors=`curl --silent http://cygwin.com/mirrors.lst | cut -d';' -f1`   ## 使用 CURL 依次检测时间 results='' for mirror in $mirrors; do     echo -n "Checking ${mirror} ... "     time=`curl -m $timeout -s -o /dev/null -w %{time_total} $mirror`     if [ "$time" = "0.000" ]; then         echo -e "\e[31mfail\e[0m"     else         echo -e "\e[32m$time\e[0m"         results="${results}\e[32m${time}\e[0m - ${mirror}\n"     fi done   echo -e "\n检测结果:" echo -e $results | sort -n | sed '1d' | head -$mirrors_count   # vim: set expandtab tabstop=4 shiftwidth=4: