10-22-2012
Unless you are intentionally restricting the portability of your code, it's unwise to use GNU long options when there exists a traditional, ubiquitous, and equivalent short option. sort -n -k1 will work just about anywhere (Linux, Solaris, AIX, HP-UX, OS X, FreeBSD, NetBSD, OpenBSD, et al). While sort -n --key=1 is unlikely to work beyond GNU/Linux.
If portability is not a concern, please disregard this post.
Regards,
Alister
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