DroneDB exposes several commands via the ddb command line application.

add - Add files and directories to an index.
build - Initialize and build an index. Shorthand for running an init,add,commit command sequence.
geoproj - Project images to georeferenced rasters
info - Retrieve information about files and directories
init - Initialize an index. If a directory is not specified, initializes the index in the current directory
remove - Remove files and directories from an index. The filesystem is left unchanged (actual files and directories will not be removed)
set - Modify EXIF values in files.
sync - Sync files and directories in the index with changes from the filesystem
thumbs - Generate thumbnails for images and rasters
tile - Generate tiles for GeoTIFFs
system - Manage ddb