Report or omit repeated lines Often used in conjunction with sort to remove dups

Option	Long Option	Description
-c	–count	Output a list of dups preceded by number of occurrences
-d	–repeated	Output only repeated lines
-f n	–skip-fields=n	Ignore n leading fields in each line.
		Default is separated by whitespace
-i	–ignore-case	Ignore case
-s n	–skip-chars=n	Skip leading n chars of each line
-u	–unique	Output only unique lines

Common uniq Options