UNIQ(1) — USER COMMANDS
NAME
uniq − remove or report adjacent duplicate lines
SYNOPSIS
uniq [ −cdu [ +|−n ] [ inputfile [ outputfile ] ]
DESCRIPTION
uniq reads the input file comparing adjacent lines. In the normal case, the second and succeeding copies of repeated lines are removed; the remainder is written on the output file. Note: repeated lines must be adjacent in order to be found; see sort(1V).
OPTIONS
−c Supersede −u and −d and generate an output report in default style but with each line preceded by a count of the number of times it occurred.
The normal output of uniq is the union of the −u and −d options.
−d Write one copy of just the repeated lines.
−u Copy only those lines which are not repeated in the original file.
The n arguments specify skipping an initial portion of each line in the comparison:
+n The first n characters are ignored. Fields are skipped before characters.
−n The first n fields together with any blanks before each are ignored. A field is defined as a string of non-SPACE, non-TAB characters separated by SPACE and TAB characters from its neighbors.
SEE ALSO
Solbourne Computer, Inc. — 9 September 1987