Suggestion: only put out number of issues

[deknos]

For new checks and feature suggestions

• [x] https://www.shellcheck.net/ (i.e. the latest commit) currently gives no useful warnings about this
• [x] I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

Here's what I wanted or expected to see:

Hi, instead of output every issue i would like to have a parameter which counts every (unwhitelisted) occurence to get a number of all the issue. for example if myscript.sh has 33 issues (which are not excepted in the code), it prints something like this:

shellcheck --count=sum myscript.sh 33

Optional would be counting and printing of occurrences of different types like

shellcheck --count=different myscript.sh
SC2059: 23
SC2086: 45

[brother]

try shellcheck -f gcc file.sh | wc -l