系统版本：MacOS High Sierra（10.13.6）
问题起因：
我想要快速查找nginx.conf文件所在的地址，根据查询，发现可以用locate工具。于是操作如下：
locate nginx.conf得到如下警告1：
WARNING: The locate database (/var/db/locate.database) does not exist.
To create the database, run the following command:
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist
Please be aware that the database can take some time to generate; once
the database has been created, this message will no longer appear.解决办法：
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist继续使用发现，上面操作没有生效。解决办法：更新库
sudo /usr/libexec/locate.updatedb上面操作有点耗时，我用ctrl+c打断了操作，再使用locate命令，从而引发了下面警告：
locate: locate database header corrupt, bigram char outside 0解决办法：继续更新库的操作，等待这个操作正确完成即可。
参考：
Problems with locate after Homebrew update on Mac
Mac 下locate命令使用问题WARNING: The locate database (/var/db/locate.database) does not exist.