UNIQ(1) (Directory and File Management Utilities) UNIQ(1)
NAME
uniq - report repeated lines in a file
SYNOPSIS
uniq [ -udc [ +n ] [ -n ] ] [ input [ output ] ]
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. Input and output should always be different. Note
that repeated lines must be adjacent in order to be found;
see sort(1). If the -u flag is used, just the lines that
are not repeated in the original file are output. The -d
option specifies that one copy of just the repeated lines is
to be written. The normal mode output is the union of the
-u and -d mode outputs.
The -c option supersedes -u and -d and generates an output
report in default style but with each line preceded by a
count of the number of times it occurred.
The n arguments specify skipping an initial portion of each
line in the comparison:
-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 tabs and
spaces from its neighbors.
+n The first n characters are ignored. Fields are
skipped before characters.
SEE ALSO
comm(1), sort(1).
Page 1 May 1989