user91618: I am following Antonopoulos' Mastering Bitcoin.  I have installed Bitcoin core and ran bitcoind for the first time. Although the book said it will remind me to create a configuration file, it did not.  It rapidly used up the disk space (I am running it on VM Ubuntu) and I had to interrupt it.  
I want to free up the used space and try again with configuration file, but I do not know what to do.

user38618: Find the data directory: https://bitcoin.stackexchange.com/a/11210
Create a file named "bitcoin.conf"
Add
    prune=550
to that file.
Restart Bitcoin Core.

91618: <p>I am following Antonopoulos' Mastering Bitcoin.  I have installed Bitcoin core and ran bitcoind for the first time. Although the book said it will remind me to create a configuration file, it did not.  It rapidly used up the disk space (I am running it on VM Ubuntu) and I had to interrupt it.  </p>

<p>I want to free up the used space and try again with configuration file, but I do not know what to do.</p>
 38618: <p>Find the data directory: <a href="https://bitcoin.stackexchange.com/a/11210">https://bitcoin.stackexchange.com/a/11210</a></p>

<p>Create a file named "bitcoin.conf"</p>

<p>Add
    prune=550
to that file.</p>

<p>Restart Bitcoin Core.</p>
