DTM Data Comparer supports following command line switches:

-r - if the project specified and configured, run compare at program startup.

-s - if the project specified and configured, run synchronization at program startup.

-q - quit application after the project execution.

-a - synchronization: disable "Add" operation for the secondary database.

-d - synchronization: disable "Delete" operation for the secondary database.

-u - synchronization: disable "Update" operation for the secondary database.

-PM - switch "performance mode" on. This mode increases comparison speed for about 10-15% but produces fewer diagnostics. The program shows {PM} in the windows title when this mode is switched on.

-c - console mode. -r or -s switch required to run the process.

-x - disable connection restoring. Please use it for corrupted profiles or incorrect connections only.

Also, you can use project name as a command line parameter. Please note that you should use quotation for path or filename with spaces:
"c:\Program Files\dcmp.exe" "D:\Projects And Files\test2testscr.dcmp"