English to Chinese Tech/Engineering IT (Information Technology) log file

Fortunately, there is a built-in control mechanism that allows you to print out only certain ｛facilities｝ (such as daemon).
Say you want to view log entries for the ｛user facility｝. To do this, issue the command dmesg --facility=user. If anything has been logged to that facility, it will print out.
请问这个facility是啥东东？