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bug#6393: The meaning of --key of sort command?
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From: |
Eric Blake |
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Subject: |
bug#6393: The meaning of --key of sort command? |
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Date: |
Thu, 10 Jun 2010 11:01:51 -0600 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-3.fc13 Lightning/1.0b2pre Mnenhy/0.8.2 Thunderbird/3.0.4 |
On 06/10/2010 10:39 AM, Peng Yu wrote:
> Hi,
>
> I don't think that I completely understand what key means. In the
> following example, I thought that --key=2 should order the lines by
> the 2nd letter in each line without reordering the lines with the same
> 2nd letter. But it turns out my understanding is not correct. For
> example, "u a" was before "a a" sorting, but "u a" is after "a a"
> after sorting.
'--key=2' implies a primary sort key from the second field (not second
letter), through the end of the line, with a secondary sort key of the
entire line. '--key=2,2' implies a primary sort key of just the second
field, with a secondary sort key of the entire line. You want
'--key=2,2 --stable', which disables the secondary sort over the entire
line.
--
Eric Blake address@hidden +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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