Update README.md
Moved `flock` information under Example and shortened it
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@@ -32,6 +32,10 @@ On OS X, it has a few disadvantages compared to Time Machine - in particular it
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0 */1 * * * if [[ -d /mnt/backup ]]; then rsync_tmbackup.sh /home /mnt/backup; fi
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* The use `flock` is recommended so that only one instance of the script runs at a given time:
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flock -n /tmp/rsync_tmbackup.lock rsync_tmbackup.sh /home /mnt/backup
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## Exclude file
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An optional exclude file can be provided as a third parameter. It should be compatible with the `--exclude-from` parameter of rsync. See [this tutorial](https://sites.google.com/site/rsync2u/home/rsync-tutorial/the-exclude-from-option) for more information.
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