fssync command not found

In this troubleshooting guide we learn how to fix fssync command not found error message

Introduction

When you run more command in linux terminal / console, you get the following error message

fssync: command not found

or when using sudo you get the following error message

sudo: fssync: command not found

Solutions to fssync: command not found

How To Fix fssync: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu fssync is provided by fssync package.

fssync is:

fssync is a 1-way file-synchronization tool that tracks inodes and maintains a local database of files that are on the remote side, making it able to:

  • handle efficiently a huge number of dirs/files
  • detect renames/moves and hard-links

It aims at minimizing network traffic and synchronizing every detail of a file system:

  • all types of inode: file, dir, block/character/fifo, socket, symlink
  • preserve hard links
  • modification time, ownership/permission/ACL, extended attributes
  • sparse files

Other features:

  • it can be configured to exclude files from synchronization
  • fssync can be interrupted and resumed at any time, making it tolerant to random failures (e.g. network error)
  • algorithm to synchronize file content is designed to handle big files like VM images efficiently, by updating fixed-size modified blocks in-place

Main usage of fssync is to prevent data loss in case of hardware failure, where RAID1 is not possible (e.g. in laptops).

On Btrfs file systems, fssync is an useful alternative to btrfs send (and receive) commands, thanks to filtering capabilities. This can be combined with Btrfs snapshotting at destination side for a full backup solution.

To fix this problem, we can install more using the command below.

sudo apt-get -y install fssync

This command might take some time to finish depending on your machine internet connection.

You can also use apt command to install fssync.

sudo apt -y install fssync

Or if you have aptitude installed you can use the following command.

sudo aptitude install fssync

Summary

In this tutorial we learn how to fix fssync command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.