UNIQ(I) 12/1/72 UNIQ(I)
uniq - report repeated lines in a file
uniq [ -udc [ +n ] [
-n ] ] [ input [ output ] ]
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 that repeated lines must be adjacent in order to
be found; see sort(I). 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 the style of -ud 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.