| 1 | .TH UNIQ 1 |
| 2 | .SH NAME |
| 3 | uniq \- report repeated lines in a file |
| 4 | .SH SYNOPSIS |
| 5 | .B uniq |
| 6 | [ |
| 7 | .B \-udc |
| 8 | [ |
| 9 | .BR + n |
| 10 | ] [ |
| 11 | .BR \- n |
| 12 | ] |
| 13 | ] [ input [ output ] ] |
| 14 | .SH DESCRIPTION |
| 15 | .I Uniq |
| 16 | reads the input |
| 17 | file comparing adjacent lines. |
| 18 | In the normal case, the second and succeeding copies |
| 19 | of repeated lines are |
| 20 | removed; the remainder is written on the output file. |
| 21 | Note that repeated lines must be adjacent |
| 22 | in order to be found; |
| 23 | see |
| 24 | .IR sort (1). |
| 25 | If the |
| 26 | .B \-u |
| 27 | flag is used, |
| 28 | just the lines that are not repeated |
| 29 | in the original file are output. |
| 30 | The |
| 31 | .B \-d |
| 32 | option specifies that |
| 33 | one copy of just the repeated lines is to |
| 34 | be written. |
| 35 | The normal mode output is the union of the |
| 36 | .B \-u |
| 37 | and |
| 38 | .B \-d |
| 39 | mode outputs. |
| 40 | .PP |
| 41 | The |
| 42 | .B \-c |
| 43 | option supersedes |
| 44 | .B \-u |
| 45 | and |
| 46 | .B \-d |
| 47 | and generates |
| 48 | an output report in default style |
| 49 | but with each line preceded by a count of the |
| 50 | number of times it occurred. |
| 51 | .PP |
| 52 | The |
| 53 | .I n |
| 54 | arguments specify skipping an initial portion of each line |
| 55 | in the comparison: |
| 56 | .TP 8 |
| 57 | .BI \- n |
| 58 | The first |
| 59 | .IR n |
| 60 | fields |
| 61 | together with any blanks before each are ignored. |
| 62 | A field is defined as a string of non-space, non-tab characters |
| 63 | separated by tabs and spaces from its neighbors. |
| 64 | .TP 8 |
| 65 | .BI + n |
| 66 | The first |
| 67 | .IR n |
| 68 | characters are ignored. |
| 69 | Fields are skipped before characters. |
| 70 | .PP |
| 71 | .SH "SEE ALSO" |
| 72 | sort(1), comm(1) |