# Command Line Usage

FreeFileSync supports additional synchronization scenarios via a command line interface. To get a syntax overview, open the console, go to the directory where FreeFileSync is installed and type:

FreeFileSync.exe -h or FreeFileSync.exe --help

## 1. Run a FreeFileSync batch job

In order to start synchronization in batch mode, supply the path of a ffs_batch configuration file as the first argument for FreeFileSync.exe:

FreeFileSync.exe "D:\Backup Projects.ffs_batch"

After synchronization one of the following status codes is returned:

Return Codes
0 - Synchronization completed successfully
1 - Synchronization completed with warnings
2 - Synchronization completed with errors
3 - Synchronization was aborted

You can evaluate these codes from a script (e.g. a cmd or bat file on Windows) and check if synchronization completed successfully:

"C:\Program Files\FreeFileSync\FreeFileSync.exe" "D:\Backup Projects.ffs_batch"
if errorlevel 1 (
::if return code is 1 or greater, something went wrong, add special treatment here
echo Errors occurred during synchronization...
pause
)

Instead of showing an error message, you can also send an email notification (using a third party tool).

Attention
If you are running the batch job unattended, make sure your script is not blocked showing a notification dialog. Consider the following options when setting up the FreeFileSync batch job:

- Set When finished to Exit to skip the summary dialog after synchronization.
- Set up error handling to Ignore errors or Cancel to stop the synchronization at the first error.

## 2. Start a FreeFileSync GUI configuration

If you pass a ffs_gui file, FreeFileSync will start in GUI mode and immediately start comparison (but only if all directories exist):

FreeFileSync.exe "D:\Manual Backup.ffs_gui"

## 3. Customize an existing configuration

You can replace the directories of a given ffs_gui or ffs_batch configuration file by using the -DirPair parameter:

FreeFileSync.exe "D:\Manual Backup.ffs_gui" -dirpair C:\NewSource D:\NewTarget

## 4. Merge multiple configurations

When more than one configuration file is provided, FreeFileSync will merge everything into a single configuration with multiple folder pairs and start in GUI mode:

FreeFileSync.exe "D:\Manual Backup.ffs_gui" "D:\Backup Projects.ffs_batch"

## 5. Use a different GlobalSettings.xml file

By default, FreeFileSync uses a single GlobalSettings.xml file containing options that apply to all synchronization tasks; for examples see Expert Settings. If you want FreeFileSync to use a different settings file instead, you can specify the path via command line:

FreeFileSync.exe "D:\My GlobalSettings.xml"