Re: Branch on sed

[Paolo Bonzini]

On 10/03/2009 04:22 PM, Norihiro Tanaka wrote:
> Hi,
>
> Which is correct result for the following commands, in which branch
> command is included, in POSIX ?

Indeed GNU sed 4.1.0 made line number addresses are "absolute": you do 
not need to match the address on the exact line corresponding to the 
first address in order to activate it.

I don't remember exactly but POSIX either does not specify it or 
specifies it like GNU sed 4.1.0 and newer do.  I also think that BSD sed 
implements it too (because I learnt about this behavior when I 
incorporated the BSD sed testsuite into GNU sed).

Here is another example that shows why GNU sed's behavior is preferrable:

seq 1 10 | sed -e '1,4d;3,6d'

Paolo