The command line option --logdest existed for specifying a log file destination in the CmdLineTask interface, and was removed in
DM-6999 per RFC-203. But such functionality is still wanted, as Paul Price commented in RFC-203 (09/Sep/16):
I think dumping the log to a file is such an important and common operation that it needs to be supported as a first-class command-line option. Having to write two lines of obscure configuration in a separate file for every command-line operation is too burdensome.