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Sync is a command used to flush the filesystem buffers (write changes still held in memory to disk). In normal operations, this is not a concern as daemons handle flushing and, during shutdown, it is usually invoked in scripts - however, it can be executed manually.


  • rsync - is a sync utility based on file timestamps, not on file contents
  • krusader - is a gui sync utility based on file contents
  • unison - is a cli sync utility based on file contents

Provided by

Most (all?) Linux distributions incorporate this from the GNU Coreutils: man page

Related Commands

  • df - Report disk usage by filesystems.
  • du - Report disk usage by directory
  • stat - Report status from an inode
  • truncate - Change file length

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