wget -O- 'http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest' | awk -F\| '/CN\|ipv4/ { printf("%s/%d\n", $4, 32-log($5)/log(2)) }' > /etc/ignore.list
#-O- 最后一个-表是把结果放到stdout

wget 从网上下载一个文件，网址:http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest。
这是亚太互联网络信息中心一个页面，记录了大量亚太地区的IP使用。下载后的文件示例：

apnic|CN|ipv4|61.87.192.0|16384|20060823|allocated
apnic|AU|ipv4|61.88.0.0|65536|20011016|allocated
apnic|JP|ipv4|61.89.0.0|65536|20040520|allocated
apnic|TH|ipv4|61.90.0.0|65536|20040511|allocated
apnic|TH|ipv4|61.91.0.0|16384|20040511|allocated
apnic|TH|ipv4|61.91.64.0|16384|20040625|allocated
apnic|TH|ipv4|61.91.128.0|8192|20040625|allocated
apnic|TH|ipv4|61.91.160.0|8192|20040913|allocated
apnic|TH|ipv4|61.91.192.0|16384|20040913|allocated
apnic|HK|ipv4|61.92.0.0|65536|20011123|allocated
apnic|HK|ipv4|61.93.0.0|65536|20020517|allocated
apnic|ID|ipv4|61.94.0.0|65536|20020111|allocated
apnic|AU|ipv4|61.95.0.0|16384|20020118|allocated
apnic|AU|ipv4|61.95.64.0|16384|20020924|allocated
apnic|IN|ipv4|61.95.128.0|16384|20030807|allocated
apnic|IN|ipv4|61.95.192.0|8192|20030807|allocated
apnic|IN|ipv4|61.95.224.0|4096|20020123|allocated
apnic|IN|ipv4|61.95.240.0|4096|20030529|allocated
apnic|KR|ipv4|61.96.0.0|1048576|20010321|allocated
apnic|JP|ipv4|61.112.0.0|1048576|20000929|allocated
apnic|CN|ipv4|61.128.0.0|131072|19990527|allocated
apnic|CN|ipv4|61.130.0.0|131072|19990624|allocated
apnic|CN|ipv4|61.132.0.0|65536|19990624|allocated
apnic|CN|ipv4|61.133.0.0|32768|19990624|allocated

awk: linux经典命令
-F指明分隔符
/CN\|ipv4/ 指明过滤条件
$4代表第四列

附3篇文章,讲了SS如何实现根据国内, 国外IP来判断是否使用SS通道:

#!/bin/shset -e -o pipefail #当有任何命令 或者 管道返回非零值就终止脚本wget -O- 'http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest' | \awk -F\| '/CN\|ipv4/ { printf("%s/%d\n", $4, 32-log($5)/log(2)) }' > /tmp/ignore.list mv /tmp/ignore.list /etc/#如有需要就重启SS和ChinaDNS
if pidof ss-redir>/dev/null; then/etc/init.d/shadowsocks rules
fiif pidof chinadns>/dev/null; then/etc/init.d/chinadns restart
fi