term% cat index.txt UNIQ(1) General Commands Manual UNIQ(1)
NAME
uniq - report repeated lines in a file
SYNOPSIS
uniq [ -udcs [ +-num ] ] [ file ]
DESCRIPTION
Uniq copies the input file, or the standard input, to the standard out‐
put, comparing adjacent lines. In the normal case, the second and suc‐
ceeding 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. Im‐
plies -u and -d.
-s Count as a duplicate if the prefix matches the previous unique
line.
-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.
SOURCE
/sys/src/cmd/uniq.c
SEE ALSO
sort(1)
BUGS
Field selection and comparison should be compatible with sort(1).
UNIQ(1)