获取最新有效期 ipv6 地址

[oktty]

Description

获取最新valid_lft时间的ipv6

• ip a命令可以查看到网口ip地址，存在多个ipv6,每个ipv6都有valid_lft和preferred_lft时间，获取最新的valid_lft有效时间(最大值)；当然你可以用将下面命令中valid_lft换成preferred_lft(其实两者效果一样)

• 使用valid_lft

  ip -6 a | awk -F '[ \t]+|/' '/inet6/ && $3 != "::1" && $3 !~ /^fe80::/ && $3 !~ /^fda8:/ {ipv6=$3; getline; if ($2=="valid_lft") {split($3, t, "sec"); if (t[1] > max) {max=t[1]; best=ipv6}}} END {print best}'

• 使用preferred_lft

  ip -6 a | awk -F '[ \t]+|/' '/inet6/ && $3 != "::1" && $3 !~ /^fe80::/ && $3 !~ /^fda8:/ {ipv6=$3; getline; if ($4=="preferred_lft") {split($5, t, "sec"); if (t[1] > max) {max=t[1]; best=ipv6}}} END {print best}'

  $3 !~ /^fe80::/是用于排除已fe80::开头的ipv6；需要排除其他已xxxx开头的ipv6自行添加

Problem

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Other Description

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Checklist

• I am using the latest version and have confirmed that the feature is not yet implemented in the latest version
• I have searched for similar feature requests before submitting this one