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.  Note that repeated lines must be adjacent in order to be found; see sort(1). 

−u Just the lines that are not repeated in the original file are output. 

−d 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. 

−c 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

sort(1), comm(1)

NEWS-OSRelease 4.2.1R