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Top Forums Shell Programming and Scripting ascending and descending sort Post 302432575 by durden_tyler on Friday 25th of June 2010 10:59:17 AM
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
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SORT(1) 						      General Commands Manual							   SORT(1)

NAME
sort - sort a file of ASCII lines SYNOPSIS
sort [-bcdfimnru] [-tc] [-o name] [+pos1] [-pos2] file ... OPTIONS
-b Skip leading blanks when making comparisons -c Check to see if a file is sorted -d Dictionary order: ignore punctuation -f Fold upper case onto lower case -i Ignore nonASCII characters -m Merge presorted files -n Numeric sort order -o Next argument is output file -r Reverse the sort order -t Following character is field separator -u Unique mode (delete duplicate lines) EXAMPLES
sort -nr file # Sort keys numerically, reversed sort +2 -4 file # Sort using fields 2 and 3 as key sort +2 -t: -o out # Field separator is : sort +.3 -.6 # Characters 3 through 5 form the key DESCRIPTION
Sort sorts one or more files. If no files are specified, stdin is sorted. Output is written on standard output, unless -o is specified. The options +pos1 -pos2 use only fields pos1 up to but not including pos2 as the sort key, where a field is a string of characters delim- ited by spaces and tabs, unless a different field delimiter is specified with -t. Both pos1 and pos2 have the form m.n where m tells the number of fields and n tells the number of characters. Either m or n may be omitted. SEE ALSO
comm(1), grep(1), uniq(1). SORT(1)
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