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What does that do?

2:47pm, Tuesday 26 October 2004 (Updated 10:21pm, Tuesday 26 October 2004)

sed '0~2d' test > $$.1 ; sed '1~2d' test > $$.2 ; \
  paste -d ' ' $$.1 $$.2 ; rm $$.1 $$.2

Optimisations welcomed. I'd particularly like to get it all into a single sed call without using temporary files.

Update:

sed -n 'N; s/\n/ /; p' test

Fab, a one-liner. Unfortunately the shorter

sed 'N; s/\n/ /' test

behaves differently with GNU sed and Tru64 sed. :-(

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