RE: OffTopic : sed : Alternate (2,4,6..) replacement

OK. You got me going on this for a solution when GNU sed is not available.
(See what you did.)

Instead of the ksh example, here's a non-GNU sed one that works. It works on GNU sed too.

sed '

   $!N
   s/\(^.*\n.*:\)\(this\)\(.*$\)/\1that\3/    p
   d
'

Here's an awk that is essentially the equivalent of the ksh thing.

awk -F':| ' '

   BEGIN{ x = 1 }
   (x = 0||(x-1)) == 1 {$2 = "that"}
   {print $1":"$2,$3,$4,$5,$6,$7,$8,$9}
'

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