v1.2.3 is a release file of the Minecraft plugin jCommands - UUID Ready. It was published on August 23, 2013 and is 0.2 MB in size. For the full description, screenshots and every other version, visit the jCommands - UUID Ready plugin page.
How to install: Put the .jar into the plugins folder of your Paper, Spigot or Bukkit server and restart the server.