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+.Dd October 8, 2015
+.Dt UNIQ 1
+.Os sbase
+.Sh NAME
+.Nm uniq
+.Nd report or filter out repeated lines in a file
+.Sh SYNOPSIS
+.Nm
+.Op Fl c
+.Op Fl d | u
+.Op Fl f Ar num
+.Op Fl s Ar num
+.Op Ar input Op Ar output
+.Sh DESCRIPTION
+.Nm
+reads the
+.Ar input
+file and writes one copy of a line from each group of consecutive
+duplicate lines to the
+.Ar output
+file.
+If no
+.Ar input
+file is given
+.Nm
+reads from stdin.
+If no
+.Ar output
+file is given
+.Nm
+writes to stdout.
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl c
+Prefix each line with the number of consecutive occurrences in
+.Ar input .
+.It Fl d | Fl u
+Print duplicate | unique lines only.
+.It Fl f Ar num | Fl s Ar num
+Ignore the first
+.Ar num
+fields | characters in each input line when doing comparisons.
+.El
+.Sh STANDARDS
+POSIX.1-2013.