Shell脚本实现检测Cygwin最快的镜像站点

#!/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
 
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