term% ls -F
term% pwd
term% cat index.txt
UNIQ(1)                     General Commands Manual                    UNIQ(1)

       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(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

       -n      The first n fields together with any blanks before each are ig‐
               nored.  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

       sort(1), comm(1)