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uniq linux command


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uniq [options] [file1 [file2]]

Remove duplicate adjacent lines from sorted file1, sending one copy of each line to file2 (or to standard output). Often used as a filter. Specify only one of -d or -u. See also comm and sort.


n, -f n, --skip-fields=n

Ignore first n fields of a line. Fields are separated by spaces or by tabs.

n, -s n, --skip-chars=n

Ignore first n characters of a field.

-c, --count

Print each line once, prefixing number of instances.

-d, --repeated

Print duplicate lines once but no unique lines.

-i, --ignore-case

Ignore case differences when checking for duplicates.

-u, --unique

Print only unique lines (no copy of duplicate entries is kept).

-w n, --check-chars=n

Compare only first n characters per line (beginning after skipped fields and characters).


Print a help message and then exit.


Print version information and then exit.


Send one copy of each line from list to output file

uniq list

Show which names appear more than once:

sort names | uniq -d

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