My attempt to exclude the check for the EOL char on my Windows machine always results in this error message:
>vendor\bin\phpcs.bat --standard=PSR2 --exclude=Generic.Files.LineEndings.InvalidEOLChar src\version.php
ERROR: The specified sniff code "Generic.Files.LineEndings.InvalidEOLChar" is invalid
Run "phpcs --help" for usage information
Can't figure out what I'm doing wrong. I have installed PHP CodeSniffer via composer and am running version 3.4.0.
The --exclude CLI argument accepts 3-part sniffs codes, but you've passed in a 4-part error code.
In your case, the sniff code is Generic.Files.LineEndings and that sniff only generates a single error code, so you'll be fine ignoring the entire sniff:
vendor\bin\phpcs.bat --standard=PSR2 --exclude=Generic.Files.LineEndings src\version.php
If you want to exclude individual error codes, or if you just want to lock down a standard for your project, you'll need to use a ruleset.xml file: https://github.com/squizlabs/PHP_CodeSniffer/wiki/Annotated-Ruleset