github-email：通过github帐号查某人可能的邮箱

https://github.com/paulirish/github-email/

Retrieve a GitHub user’s email even though it’s not public

Emails from recent commits

每一个commit都会生成event，可以在github的api查到。（即便删除那个commit，event里依然有。。。

curl https://api.github.com/users/$user/events|sed -nE 's#^.*"(email)": "([^"]+)",.*$#\2#p'|sort -u

Emails from owned-repo recent activity

最近的拥有的项目，中的参与人的邮箱。

curl "https://api.github.com/users/$user/repos?type=owner&sort=updated" -s \
        | sed -nE 's#^.*"name": "([^"]+)",.*$#\1#p' \
        | head -n1