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Full Discussion: Sorting by pairs
Top Forums UNIX for Dummies Questions & Answers Sorting by pairs Post 302949610 by Don Cragun on Monday 13th of July 2015 10:17:47 PM
Old 07-13-2015
No. The sort utility sorts lines; not groups of lines. You can however, join pairs of lines, sort the result, and then split the sorted output into pairs of lines again. Assuming that there aren't any tab characters in your input file, a simple way to do it would be:
Code:
awk '{printf("%s%s",$0,(NR%2)?"\t":"\n")}' infile|sort -k2,2n|tr '\t' '\n'

which with the following infile contents (modified so we can be sure that the correct even numbered lines in the output follow the same lines they followed in the input file):
Code:
ID 15
GNJSMKSNS 1
ID 25
GNJSMKSNS 2
ID 1
GNJSMKSNS 3

produces the output:
Code:
ID 1
GNJSMKSNS 3
ID 15
GNJSMKSNS 1
ID 25
GNJSMKSNS 2

Of course, if all of the even numbered lines in your input files are identical (as in your sample); you could delete the even numbered lines, sort the remaining lines, and reinsert the deleted lines.
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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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