Plan 9 - man page for uniq (plan9 section 1)
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uniq - report repeated lines in a file
uniq [ -udc [ +-num ] ] [ file ]
Uniq copies the input file, or the standard input, to the standard output, comparing adja-
cent lines. In the normal case, the second and succeeding copies of repeated lines are
removed. Repeated lines must be adjacent in order to be found.
-u Print unique lines.
-d Print (one copy of) duplicated lines.
-c Prefix a repetition count and a tab to each output line. Implies -u and -d.
-num The first num fields together with any blanks before each are ignored. A field is
defined as a string of non-space, non-tab characters separated by tabs and spaces
from its neighbors.
+num The first num characters are ignored. Fields are skipped before characters.
Field selection and comparison should be compatible with sort(1).
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