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lang-bash
ls -l [[:lower:]]instead ofls -l [a-z].mkdir lctest; cd lctest; touch w; touch z; ls -l [:lower:]; echo =====; ls -l [[:lower:]]. The "z" file is only listed by the secondlsbecause it's asking for lower case single-letter filenames. The firstls- the one without the outer square brackets - is asking for single-character file names from the list of characters ":", "l", "o", "w", "e", and "r". In both cases the outermost square brackets delimit a bracket expression which lists characters and classes. In the case of[[:lower:]], the inner square brackets, colons and word name a character class. ...