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Just annotations of little "how to's", so I know I can find how to do something I've already done when I need to do it again, in case I don't remember anymore, which is not unlikely. Hopefully they can be useful to others, but I can't guarantee that it will work, or that it won't even make things worse.
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A much faster "du" alternative for the current folder (non-recursive)

Posted 06-17-2014 at 09:55 PM by the dsc
Updated 06-17-2014 at 10:21 PM by the dsc (grammar, "benchmarks")

Code:
find . -maxdepth 1 -printf %k"000\n" | awk '{  sum += $1 } END { print sum }' | numfmt --from=auto --to=iec-i
I was annoyed with the fact that "du", with whatever parameters I tried to get only the usage for the files on the root of the current folder (i. e., non-recursive), took ages to give the result, while the value comes comparatively instantaneously when you're browsing the folders on a file manager like Konqueror or some other, with that indication. I don't know what are the inner workings of these file managers, but it seems much more time-effective than du.

The one-liner above is a slight change over something I've found in this very forum:

https://www.linuxquestions.org/quest...folder-140208/

I just added maxdepth=1, and "000" missing to make up Kbs, which seems to be more often the case, and results in correctly human-readable output from those "numfmt" parameters, which I also added from somewhere else. But it's probably not the best way to go about doing it, math-wise, and disk-usage-technical-wise.



It seems to be specially faster than "du" on folders with lots and lots of files, but to my astonishment "du" is actually faster sometimes.

Two comparisons with "time"

du -Ss:
real 0m6.184s
user 0m0.005s
sys 0m0.100s

find-awk-pipe-thing:
real 0m0.131s
user 0m0.010s
sys 0m0.011s


In another folder, in the reversed sequence (trying to counterbalance some eventual disk-cache effect of soe sort):


find-awk-pipe-thing:
real 0m3.266s
user 0m0.013s
sys 0m0.050s

du -Ss:
real 0m6.839s
user 0m0.015s
sys 0m0.196s
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