Indeed, it looks like there's difference between Sun sort and GNU sort::
blizinski at cabbage ~ $ uname -a
SunOS cabbage.dub.corp.google.com 5.10 Generic_137138-09 i86pc i386 i86pc
blizinski at cabbage ~ $ cat /etc/release
Solaris 10 10/08 s10x_u6wos_07b X86
Copyright 2008 Sun Microsystems, Inc. All Rights Reserved.
Use is subject to license terms.
Assembled 27 October 2008
blizinski at cabbage ~ $ printf "a 2\nb 1\n" | sort -n -k1.3,1.1
a 2
b 1
blizinski at cabbage ~ $ printf "aa 2\nbb 1\n" | sort -n -k2.2,1.2
aa 2
bb 1
blizinski at cabbage ~ $ printf "a 2\nb 1\n" | gsort -n -k1.3,1.1
b 1
a 2
blizinski at cabbage ~ $ printf "aa 2\nbb 1\n" | gsort -n -k2.2,1.2
bb 1
aa 2
(I alias sort='gsort' for interactive sessions on Solaris.)
Maciej
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