manpagez: man pages & more
man uniq(1)
Home | html | info | man
uniq(1)                          User Commands                         uniq(1)


       uniq - report or omit repeated lines


       uniq [OPTION]... [INPUT [OUTPUT]]


       Filter adjacent matching lines from INPUT (or standard input), writing
       to OUTPUT (or standard output).

       With no options, matching lines are merged to the first occurrence.

       Mandatory arguments to long options are mandatory for short options

       -c, --count
              prefix lines by the number of occurrences

       -d, --repeated
              only print duplicate lines, one for each group

       -D     print all duplicate lines

              like -D, but allow separating groups with an empty line;

       -f, --skip-fields=N
              avoid comparing the first N fields

              show all items, separating groups with an empty line;

       -i, --ignore-case
              ignore differences in case when comparing

       -s, --skip-chars=N
              avoid comparing the first N characters

       -u, --unique
              only print unique lines

       -z, --zero-terminated
              line delimiter is NUL, not newline

       -w, --check-chars=N
              compare no more than N characters in lines

       --help display this help and exit

              output version information and exit

       A field is a run of blanks (usually spaces and/or TABs), then non-blank
       characters.  Fields are skipped before chars.

       'uniq' does not detect repeated lines unless they are adjacent.  You
       may want to sort the input first, or use 'sort -u' without 'uniq'.


       Written by Richard M. Stallman and David MacKenzie.


       GNU coreutils online help: <>
       Report any translation bugs to <>


       Copyright © 2024 Free Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or later <>.
       This is free software: you are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.


       comm(1), join(1), sort(1)

       Full documentation <>
       or available locally via: info '(coreutils) uniq invocation'

GNU coreutils 9.5                 March 2024                           uniq(1)

coreutils 9.5 - Generated Thu Apr 18 15:19:53 CDT 2024
© 2000-2024
Individual documents may contain additional copyright information.