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Even simpler! Use du ... the -s and -c flags summarize and print a grand total of all files recursively. The -b flag prints in byte format. You can use the -h flag instead to print in human readable format.
Computes total size of files in a directory. This value is different "du -b" because doesn't includes directory sizes.
| sed "s/$/\/(1024\*1024\*1024)/" | bc
to get size in GB
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