Say what you will about the Ten Commandments, you must always come back to the pleasant fact that there are only ten of them.
H. L. Mencken
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Nice challenge. There could be a shorter way to do this, but I used the branch technique with labels described above and came up with:
sed -e :a -e 's/^\(-*\)-/\1N/;ta' -e :b -e 's/-\(-*\)$/N\1/;tb'
The first two expressions set a label then loop substituting the dashes inside out. Then I basically mirrored the process for the backside.
$ cat taxon
$ cat taxon | sed -e :a -e 's/^\(-*\)-/\1N/;ta' -e :b -e 's/-\(-*\)$/N\1/;tb'
(why do I need your e-mail?)
It would be nice if you left your e-mail address. Sometimes I want to send a private message, or just thank for the great comment. Having your e-mail really helps.
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(Your twitter handle, if you have one.)
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