svnversion is a program for summarizing the revision mixture of a working copy. The resultant revision number, or revision range, is written to standard output.

It’s common to use this output in your build process when defining the version number of your program:

svnversion [OPTIONS] [WC_PATH [TRAIL_URL]]

TRAIL_URL, if present, is the trailing portion of the URL used to determine whether WC_PATH itself is switched (detection of switches within WC_PATH does not rely on TRAIL_URL).

When WC_PATH is not defined, the current directory will be used as the working copy path. TRAIL_URL cannot be defined if WC_PATH is not explicitly given.