Mac 下locate命令使用问题WARNING: The locate database (/var/db/locate.database) does not exist.

想在Mac下使用locate时，提醒数据库没创建:

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.

根据提示使用 

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist 

 并没有生效。

需要执行

sudo /usr/libexec/locate.updatedb 进行库更新。