unison

TLDR

Sync directories

$ unison [dir1] [dir2]

Sync with SSH

$ unison [local/path] ssh://[user@host]/[path]

Batch mode

$ unison -batch [dir1] [dir2]

Use profile

$ unison [profilename]

Show differences

$ unison -diff [dir1] [dir2]

SYNOPSIS

unison [-batch] [profile] root1 root2

DESCRIPTION

unison synchronizes files. It's bidirectional sync.
Two-way sync. Changes both directions.
Conflict detection. Manual resolution.
SSH support. Remote sync.
Profiles. Save configurations.

PARAMETERS

-batch

Non-interactive.

-auto

Accept defaults.

-diff

Show differences.

-force ROOT

Force from root.

-ignore PATTERN

Ignore pattern.

-path PATH

Sync specific path.

CAVEATS

Same version both ends. Conflicts need attention. Initial sync slow.

HISTORY

Unison was developed at the University of Pennsylvania as a file synchronization tool supporting bidirectional sync.