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Problem with sort +4

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# 1  
Old 05-09-2011
Problem with sort +4
Apologies if this should be in 'unix for dummies' thread..

I have a large file containing records like this:
Code:
16 Feb 02:49 s_A123_ctas_log.20100216024000.bin
26 Feb 02:55 s_B123_ctas_log.20100226024000.bin
05 Mar 05:22 s_A127_ctas_log.20100305024000.bin

I want to sort it by column 4 (just the file names) but can't get it to work. I've tried.
Code:
cat filename | sort -nk4 >newfile
sort +4 filename >newfilename

The only command that works (sorts it via column4) is
Code:
sort +4 -d -u filename >newfilename

But for some reason it only does one record!

Any help much appreciated as usual..

Moderator's Comments:
Mod Comment Please use [code] and [/code] tags when posting code, data or logs etc. to preserve formatting and enhance readability, thanks.
Last edited by zaxxon; 05-09-2011 at 07:33 AM.. Reason: code tags
# 2  
Old 05-09-2011
I added some more lines in the example; sorting starts for the 1st 3 characters of field 4, then continues with the 4th to 6th character. Not sure if this is what you are looking for but you can see how it works.

Code:
$> cat infile
16 Feb 02:49 s_A123_ctas_log.20100216024000.bin
26 Feb 02:55 s_B123_ctas_log.20100226024000.bin
05 Mar 05:22 s_A127_ctas_log.20100305024000.bin
05 Mar 05:22 b_A527_ctas_log.20100305024000.bin
05 Mar 05:22 s_A027_ctas_log.20100305024000.bin
$> sort -t" " -k 4.1,4.3 -k 4.4n,4.6n infile
05 Mar 05:22 b_A527_ctas_log.20100305024000.bin
05 Mar 05:22 s_A027_ctas_log.20100305024000.bin
16 Feb 02:49 s_A123_ctas_log.20100216024000.bin
05 Mar 05:22 s_A127_ctas_log.20100305024000.bin
26 Feb 02:55 s_B123_ctas_log.20100226024000.bin

This User Gave Thanks to zaxxon For This Post:
Grueben
# 3  
Old 05-09-2011
In the old "sort +n" syntax, the fields are numbered from zero. Thus you would need "sort +3" not "sort +4".
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