osync

Two-way file synchronization script built on rsync with fault tolerance and near real-time sync.

FreeOpen sourceLinuxCommand line
Official websitegithub.com

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About osync

osync is a shell script that performs bidirectional file synchronization using rsync. It is built to tolerate faults, supports POSIX ACLs, can limit when syncs run, and offers near real-time sync by watching for changes.

It can sync local folders or a local and a remote target, and ships service files for systemd and OpenRC plus a batch script for running several jobs. It suits administrators who want two-way sync on servers without running a heavier sync daemon.

Strengths

  • Bidirectional sync on top of standard rsync
  • Fault tolerance and POSIX ACL support
  • Near real-time mode and time controls
  • Service files for systemd and OpenRC

Limitations

  • Command-line only, configured through files
  • Needs rsync and a Unix-like shell environment

Details

Pricing
FreeFree and open source.
License
Open source, license not stated
Developer
deajan
Platforms
Linux, Command line
How it runs
Downloadable app
Account
Not required
Works offline
Yes
Best suited for
Server administrators needing two-way sync between machines with rsync
Categories
File sync, CLI tools
Last verified
Added
Provenance
Facts checked against the developer's own pages and store listings, 1 sources on file.

Alternatives to osync

Compare all

Software that can replace osync for an important use case, and what changes if you switch.

  • Unison

    Synchronize two file collections while preserving changes from both sides.

    FreeOpen sourceWindowsmacOSLinux

    Unison also syncs two file collections in both directions, adds Windows and macOS support, but may need a decision on conflicting edits.

  • Lsyncd

    A live syncing daemon that watches local directories and mirrors changes to remote targets with rsync.

    FreeOpen sourceLinuxCommand line

    Lsyncd mirrors changes in near real time using rsync and SSH with Lua configuration, but only one way rather than bidirectional.

  • Syncthing

    Keeps folders identical across your own machines, directly between them, with no cloud account in the middle.

    FreeOpen sourceWindowsmacOSLinuxCommand lineSelf-hosted

    Syncthing replaces rsync scripts with continuous two-way sync, TLS encryption and versioning across Windows, macOS, Linux and BSD, but both devices must be online.

  • rsync

    The classic delta-transfer tool for copying and mirroring files.

    FreeOpen sourceWindowsmacOSLinuxCommand line

    rsync is the underlying delta-transfer tool osync builds on, offering one-way copies without osync's bidirectional logic or fault tolerance.

  • FreeFileSync

    Compares two folders, shows exactly what differs, and copies only what changed.

    FreeOpen sourceWindowsmacOSLinux

    FreeFileSync adds a graphical interface with two-way, mirror and update modes and versioning on Windows, macOS and Linux, though its installer carries advertising.

  • Mutagen

    Open-source tool for real-time file sync and network forwarding between local machines and remote containers.

    FreeOpen sourceCommand line

    Mutagen provides two-way real-time sync with SSH and Docker container support, but it is aimed at developer code rather than general server files.

Similar software

Related functionality, not necessarily a direct replacement.

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