du -h -s *
lists current directories and their sizes
grep -r "SEARCH STRING" /directory/name/*
search for a string inside files
hdparm -tT /dev/sda1
will give disk throughput speeds in MB/sec
find in files
grep -rn texttofind /path/to/search
r - recursive
n - show line number
replace in files
sed -i 's/original/new/g' filename
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