unison
Bidirectional file synchronization tool. tldr-pages
On several platforms
Several platforms
Sync two directories (creates log first time these two directories are synchronized)
unison path/to/directory_1 path/to/directory_2IdentifyAutomatically accept the (non-conflicting) defaults
unison path/to/directory_1 path/to/directory_2 -autoIdentifyIgnore some files using a pattern
unison path/to/directory_1 path/to/directory_2 -ignore patternIdentifyView documentation
unison -doc topicsIdentify