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Systems & Data Center · Intermediate

rsync

A Linux file synchronization tool that efficiently copies only changed data, locally or over SSH.

Definition

rsync's delta algorithm transfers only differences, making it ideal for backups and migrations. -a preserves permissions, ownership and timestamps, --delete mirrors deletions and -n performs a dry run.

Example

rsync -avz --delete /srv/www/ backup01:/backups/www/ mirrors a web root to a backup host.

Exam tip

A trailing slash on the source copies its contents rather than the directory itself.

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