/fileLogger[n Logs the build output to a file. By default the file is in the current directory and named "msbuild[n].log". ...

/fileLogger[n]     Logs the build output to a file. By default                      the file is in the current directory and named                       "msbuild[n].log". Events from all nodes are combined into                      a single log. The location of the file and other                      parameters for the fileLogger can be specified through                       the addition of the "/fileLoggerParameters[n]" switch.                      "n" if present can be a digit from 1-9, allowing up to                       10 file loggers to be attached. (Short form: /fl[n])