1UNIQ(1)                          User Commands                         UNIQ(1)
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NAME

6       uniq - report or omit repeated lines
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SYNOPSIS

9       uniq [OPTION]... [INPUT [OUTPUT]]
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DESCRIPTION

12       Filter  adjacent matching lines from INPUT (or standard input), writing
13       to OUTPUT (or standard output).
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15       With no options, matching lines are merged to the first occurrence.
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17       Mandatory arguments to long options are  mandatory  for  short  options
18       too.
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20       -c, --count
21              prefix lines by the number of occurrences
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23       -d, --repeated
24              only print duplicate lines, one for each group
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26       -D     print all duplicate lines
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28       --all-repeated[=METHOD]
29              like  -D,  but  allow  separating  groups  with  an  empty line;
30              METHOD={none(default),prepend,separate}
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32       -f, --skip-fields=N
33              avoid comparing the first N fields
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35       --group[=METHOD]
36              show  all  items,  separating  groups  with   an   empty   line;
37              METHOD={separate(default),prepend,append,both}
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39       -i, --ignore-case
40              ignore differences in case when comparing
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42       -s, --skip-chars=N
43              avoid comparing the first N characters
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45       -u, --unique
46              only print unique lines
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48       -z, --zero-terminated
49              line delimiter is NUL, not newline
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51       -w, --check-chars=N
52              compare no more than N characters in lines
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54       --help display this help and exit
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56       --version
57              output version information and exit
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59       A field is a run of blanks (usually spaces and/or TABs), then non-blank
60       characters.  Fields are skipped before chars.
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62       Note: 'uniq' does not detect repeated lines unless they  are  adjacent.
63       You may want to sort the input first, or use 'sort -u' without 'uniq'.
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AUTHOR

66       Written by Richard M. Stallman and David MacKenzie.
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REPORTING BUGS

69       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
70       Report any translation bugs to <https://translationproject.org/team/>
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73       Copyright  ©  2020  Free Software Foundation, Inc.  License GPLv3+: GNU
74       GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
75       This is free software: you are free  to  change  and  redistribute  it.
76       There is NO WARRANTY, to the extent permitted by law.
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SEE ALSO

79       comm(1), join(1), sort(1)
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81       Full documentation <https://www.gnu.org/software/coreutils/uniq>
82       or available locally via: info '(coreutils) uniq invocation'
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86GNU coreutils 8.32                 July 2021                           UNIQ(1)
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