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From: Duncan <1i5t5.duncan@cox.net>
Subject: Re: using fio to test btrfs compression
Date: Thu, 21 Sep 2017 11:42:22 +0000 (UTC)
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shally verma posted on Wed, 20 Sep 2017 16:40:15 +0530 as excerpted:

> Is there any command that i can run to confirm file has been compressed?

There is the quite recently posted (and actively updated since then) 
compsize command.

https://github.com/kilobyte/compsize

-- 
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"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman