0. 通过googel的dns服务器，获取出口的IPV6地址

dig -6 TXT +short o-o.myaddr.l.google.com @ns1.google.com | sed 's|"||g'
或者
dig @ns1.google.com -t txt o-o.myaddr.l.google.com +short | tr -d \"

通过查询一个 特殊地址（ o-o.myaddr.l.google.com ） 的txt记录

或者通过一个http服务

curl http://icanhazip.com
或者
curl -s ipv6.icanhazip.com
或者
curl api64.ipify.org
或者
curl 'https://api64.ipify.org?format=json'
或
curl 6.ipw.cn 

1. 通过查询本机的路由表

ip route get 2001:4860:4860::8888 | sed -n '/src/{s/.*src *\([^ ]*\).*/\1/p;q}'

sed命令解释

sed            # the sed executable located via $PATH
-n             # no output unless explicitly requested
'              # begin the command space
/src/          # regex match the string 'src'
{              # begin a block of commands **
s/             # begin a substitution (match)
  .*src *      # match anything leading up to and including src and any number of spaces
  \([^ ]*\)    # define a group containing any number of non spaces
  .*           # match any trailing characters (which will begin with a space because of the previous rule).
/              # begin the substitution replacement
  \1           # reference the content in the first defined group
/              # end the substitution
p              # print (explicitly, remember) the result
;              # designate the end of the command
q              # quit
}              # end the block of commands
'              # end the command space

或者用awk也可以

ip route get 2001:4860:4860::8888 |  awk '{gsub(".*src",""); print $1; exit}'

或者让ip命令输出json

ip -6 -j route get 2001:4860:4860::8888 

prefsrc的值，就是

或者

ip route get 2001:4860:4860::8888 | grep src| sed 's/.*src \(.*\)$/\1/g'

2. 用ip 命令获取地址 global类型地址

ip -6 a show scope global  up | egrep  -o '([0-9a-f:]+:+)+[0-9a-f]+'  -m 1

只匹配第1个地址

3. 删除路由器上 deprecated 的地址

 ip -6  addr  show   dev br-lan | grep deprecated  | sed 's/.*inet6 \(.*\)$/\1/g'


ip -6  addr  show   dev   enp1s0    | sed -n '/deprecated/{s/.*inet6 *\([^ ]*\).*/\1/p;q}'
ip -6  addr  show   dev   enp1s0    | grep deprecated  | egrep  -o '([0-9a-f:]+:+)+[0-9a-f]+'  -m 1



ip -6 addr del        ....       dev br-lan