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ascending and descending sort

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# 1  
Old 06-25-2010
Question ascending and descending sort
Hi

I have a problem with sort command :

Code:
sort -nk 1.28,1.34 file | sort -nrk 1.27 file | sort -nk 1.22,1.25 file |sort -nk 1.13,1.21 file | sort -nk 1.9,1.12 file | sort -nk 1.1,1.8 file

This is the input file
Code:
0000000100010000000200004090317003
0000000100010000000230001020592002
0000000100010000000230001090588002
0000000100010000000200000090317003
0000000100010000000130001090588002
0000000200010000000100000090317003
0000000300010000000130001000592002

And the output file is
Code:
0000000100010000000130001090588002
0000000100010000000200000090317003
0000000100010000000200004090317003
0000000100010000000230001020592002
0000000100010000000230001090588002
0000000200010000000100000090317003
0000000300010000000130001000592002

descending sorting is not applied on field 27, and ascending sorting is not applied on field 28-34.

Thanks for your help
Last edited by radoulov; 06-25-2010 at 11:38 AM.. Reason: Please use code tags!
# 2  
Old 06-25-2010
I can't understand your one-liner. But. To get ascending and descending sort order in the same sort:
example
Code:
sort -k1.1,1.10r  -k1.12,1.13 infile > outfile

The trailing "r" reverses the sort sequence for the one field only. In the example the first field. You can use a trailing "n" and many of the other qualifiers to change sort behavior on a per field basis.

also note: sort -k 1.27 means not a single character in the field - it means the field is the whole line from position 27 all the way to the end.
This User Gave Thanks to jim mcnamara For This Post:
Fafa
# 3  
Old 06-25-2010
I think those successive sorts keep overriding the order that resulted from the prior commands.

Code:
$
$ cat f55
10~123
10~099
10~880
12~451
12~110
09~009
09~101
$
$ sort -t"~" -nk2,2 f55
09~009
10~099
09~101
12~110
10~123
12~451
10~880
$
$ # numeric ascending sort of 2nd field; "~" being the delimiter
$
$ sort -t"~" -nk2,2 f55 | sort -t"~" -nrk1,1
12~451
12~110
10~880
10~123
10~099
09~101
09~009
$
$ # numeric descending sort of 1st field; "~" being the delimiter
$ # but the order resulting from the first sort is lost now
$

Ultimately, all I could figure out is that your data has the first 8 characters sorted in numerically ascending order since that's the last sort command in the pipeline.

tyler_durden
This User Gave Thanks to durden_tyler For This Post:
Fafa
# 4  
Old 06-25-2010
MySQL
Yes, There is a problem with successive sorts. I don't know how is the priority is managed in this case.

I changed the sort command like that and it's ok now :

cat "$1" |sort -nk 1.1,1.8 -k 1.9,1.12 -k 1.13,1.21 -k 1.22,1.25 -k 1.28,1.34 -k 1.27r > "$1"_tmp

Thanks for your help
Fafa
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