на команду csslint консолька не ругается
Если речь таки о sublime, то :>>> csslint Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'csslint' is not defined
А если речь о cmd:C:\WINDOWS\system32>csslintUsage: csslint-rhino.js [options]* [file|dir]*
Global Options
  --help                                   Displays this information.
  --format=<format>                        Indicate which format to use for output.
  --list-rules                             Outputs all of the rules available.
  --quiet                                  Only output when errors are present.
  --errors=<rule[,rule]+>                  Indicate which rules to include as errors.
  --warnings=<rule[,rule]+>                Indicate which rules to include as warnings.
  --ignore=<rule[,rule]+>                  Indicate which rules to ignore completely.
  --exclude-list=<file|dir[,file|dir]+>    Indicate which files/directories to exclude from being linted.
  --version                                Outputs the current version number.