how do I use phpcbf?
The phpcs/phpcbf standard in use is a modified Drupal standard, so you call the standard of "Drupal":

phpcbf --standard="Drupal" filename.php

However, if you ALSO have unmodified copies of the Drupal standard installed, the trick is to make sure that you're calling the correct version of phpcbf.  For instance, I get this:

mycomputer» which phpcbf
/home/jon/local/civicrm-buildkit/bin/phpcbf

If your default phpcbf isn't the one installed with civicrm-buildkit, make sure to specify the full path to the one that is.

If that doesn't work:
civilint is a script.  So you can edit it in a text editor.  In the latest version, line 179 reads:

xargs $BINDIR/phpcs --standard="$PHPCS_STD" &lt; "$TMP/php.txt"

Add an "echo" into it like so:

xargs echo $BINDIR/phpcs --standard="$PHPCS_STD" &lt; "$TMP/php.txt"


Run civilint again:

civilint myfile.php

Instead of outputting the result of phpcs it should instead show the command it WOULD have run.  In my case, it's:

/home/jon/local/civicrm-buildkit/bin/phpcs --standard=/home/jon/local/civicrm-buildkit/vendor/drupal/coder/coder_sniffer/Drupal fastactionlinks.php


Change phpcs to phpcbf and run that command:

/home/jon/local/civicrm-buildkit/bin/phpcbf --standard=/home/jon/local/civicrm-buildkit/vendor/drupal/coder/coder_sniffer/Drupal fastactionlinks.php


Note Don't forget to remove the echo when you're done!