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uniq

report or omit repeated lines

References

  • man uniq

Options

Common

  • -c, --count Prefix lines by the number of occurrences
  • -i, --ignore-case Ignore differences in case when comparing

Maybe

  • -d, --repeated Only print duplicate lines, one for each group
  • -s, --skip-chars=N Avoid comparing the first N characters
  • -u, --unique Only print unique lines
  • -w, --check-chars=N Compare no more than N characters in lines

Seldom

  • -D, --all-repeated[=METHOD] Print all duplicate lines groups can be delimited with an empty line METHOD={none(default),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(default),prepend,append,both}

Usage

Default

Sample

$ cat txt1
test 30
test 30
test 30
Hello 95
Hello 95
Hello 95
Hello 95
Linux 85
Linux 85
$ uniq txt1
test 30
Hello 95
Linux 85

Count

$ uniq -c txt1
      3 test 30
      4 Hello 95
      2 Linux 85

Ignore Case

Sample

$ cat txt2
Test 30
test 30
test 30
Hello 95
Hello 95
hello 95
hello 95

Default

$ uniq txt2
Test 30
test 30
Hello 95
hello 95

Ignore Case

$ uniq -i txt2
Test 30
Hello 95

Repeated

Sample

$ cat txt3
test 30
Hello 95
Hello 95
Linux 85
Linux 85
Linux 85
$ uniq -d txt3
Hello 95
Linux 85

Unique

$ uniq -u txt3
test 30

Skip Chars

Sample

$ cat txt4
Apple
Apple
Application
Application
Station
Station
Section
Section
$ uniq -w3 txt4
Apple
Station
Section

Check Chars

$ uniq -s4 txt4
Apple
Application
Station

Sort & Uniq

Sample

$ cat txt5
Apple
Application
Application
Apple
$ uniq txt5
Apple
Application
Apple
$ sort txt5 | uniq
Apple
Application