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Re: bug report - uniq
From: |
Eric Blake |
Subject: |
Re: bug report - uniq |
Date: |
Mon, 17 Dec 2007 06:15:00 -0700 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.9) Gecko/20071031 Thunderbird/2.0.0.9 Mnenhy/0.7.5.666 |
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According to Jiusheng Chen on 12/16/2007 11:13 PM:
> Hello,
>
> Can someone explain why the following happens?
>
> address@hidden:~/DE_COUNT/loser_percentage_analysis/mysql_outputs$ uniq
> test_uniq
> 106996516444209225
> 1
> 106996516444209225
> 1
Not a bug. Reread 'uniq --help', in particular, the bit about:
| Discard all but one of successive identical lines from INPUT (or
| standard input), writing to OUTPUT (or standard output).
If your file is not sorted beforehand, then uniq is not going to sort it
either. You may be interested in 'sort -u'.
As an aside, I'm wondering if the --help output for uniq should be a bit
more explicit about this property; contrast it with the output for join,
which states:
|Important: FILE1 and FILE2 must be sorted on the join fields.
|E.g., use `sort -k 1b,1' if `join' has no options.
- --
Don't work too hard, make some time for fun as well!
Eric Blake address@hidden
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