Oneliners

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MySQL

Get the "hit rate" percentage of Connections vs. Threads_created, helps you with finding the sweet spot for thread_cache_size (the closer to 100%, the better):

echo "scale=4; 100-`mysql -NB -e "SHOW STATUS LIKE 'Threads_created'; SHOW STATUS LIKE 'Connections';" | awk '{print $2}' | tr '\n' '/'`100" | bc

Filesystem

Get the size of the a folder and it's subdirectories, sorted by size:

du --max-depth=1 -k /path/to/folder | sort -nr | cut -f2 | xargs -d '\n' du -sh