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get diskusage of files (in this case logfiles in /var/log) modified during the last n days:
sudo find /var/log/ -mtime -n -type f | xargs du -ch
n -> last modified n*24 hours ago
Numeric arguments can be specified as
+n for greater than n,
-n for less than n,
n for exactly n.
=> so 7*24 hours (about 7 days) is -7
sudo find /var/log/ -mtime -7 -type f | xargs du -ch | tail -n1
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