UNIQ(1) User Commands UNIQ(1) NAME uniq - report or omit repeated lines SYNOPSIS uniq [OPTION]... [INPUT [OUTPUT]] DESCRIPTION Filter adjacent matching lines from INPUT (or standard input), writing to OUTPUT (or stan- dard output). With no options, matching lines are merged to the first occurrence. Mandatory arguments to long options are mandatory for short options too. -c, --count prefix lines by the number of occurrences -d, --repeated only print duplicate lines, one for each group -D print all duplicate lines --all-repeated[=METHOD] like -D, but allow separating groups with an empty line; METHOD={none(de- fault),prepend,separate} -f, --skip-fields=N avoid comparing the first N fields --group[=METHOD] show all items, separating groups with an empty line; METHOD={separate(de- fault),prepend,append,both} -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 --version 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. Note: 'uniq' does not detect repeated lines unless they are adjacent. You may want to sort the input first, or use 'sort -u' without 'uniq'. AUTHOR Written by Richard M. Stallman and David MacKenzie. REPORTING BUGS GNU coreutils online help: <https://www.gnu.org/software/coreutils/> Report any translation bugs to <https://translationproject.org/team/> COPYRIGHT Copyright (C) 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO comm(1), join(1), sort(1) Full documentation <https://www.gnu.org/software/coreutils/uniq> or available locally via: info '(coreutils) uniq invocation' GNU coreutils 8.32 February 2024 UNIQ(1)
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