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uniq linux command

linux

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uniq

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.

Options

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).

--help

Print a help message and then exit.

--version

Print version information and then exit.

Examples

Send one copy of each line from list to output file list.new:

uniq list list.new

Show which names appear more than once:

sort names | uniq -d





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