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Computing dirvish image disk usage

It's sometimes hard to detect the size of a dirvish backup image; here's one way to do it.

dirvish is a fantastic backup system that we use extensively.  It's very easy to create many incremental snapshots with it.  One minor problem is determining the disk space that each snapshot actually uses.

This shell script:

for dir in /path-to-vault/* ; do 
sum=0
for s in `find $dir -type f -links 1 -print0 | xargs -0 stat -c '%s'` ; do
sum=`expr $sum + $s`
done
echo $dir $sum
done

will tell you the size, in bytes, of files that belong only to a single snapshot.

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