uniq¶

collapse adjacent duplicate lines
NAME
    uniq - collapse adjacent duplicate lines

SYNOPSIS
    uniq [file]

DESCRIPTION
    Prints a file (or standard input) with adjacent duplicate lines
    collapsed to one -- a line is printed only when it differs from the
    line before it. Only *adjacent* duplicates are removed, so uniq is
    usually paired with sort. uniq is a /bin program.

EXAMPLES
    uniq U.TXT
    sort f | uniq            the usual pairing

SEE ALSO
    sort, wc