unison

Bidirectional file synchronisation tool. More information: https://www.cis.upenn.edu/~bcpierce/unison/download/releases/stable/unison-manual.html.

Sync two directories (creates log first time these two directories are synchronised):

unison {{path/to/directory_1}} {{path/to/directory_2}}

Automatically accept the (non-conflicting) defaults:

unison {{path/to/directory_1}} {{path/to/directory_2}} -auto

Ignore some files using a pattern:

unison {{path/to/directory_1}} {{path/to/directory_2}} -ignore {{pattern}}

Show documentation:

unison -doc {{topics}}