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UNIX in a Nutshell: System V Edition

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UNIX Commands
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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 -c, -d, or -u. See also comm and sort.



Print each line once, counting instances of each.


Print duplicate lines once, but no unique lines.


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


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


Ignore first n characters of a field.


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

Show which lines appear exactly three times:

sort names | uniq -c | grep "3 "

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