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On Wed, Aug 16, 2017 at 04:58:24AM -0400, Gene Heskett wrote:
> On Wednesday 16 August 2017 03:28:43 Clive Standbridge wrote:
>
> > oldIFS="$IFS"; IFS=': '; ip -o link | while read num interface other;
> > do declare -p interface; done; IFS="$oldIFS"
>
> Now thats an interesting bit of bashism, and deeper into it than I have
> waded. But for this local network, I know what they are so I can't think
> of a situation that would make me use it. But it may well be useful in
> the future, so the message is marked to protect it from the expiry
> rules.
Nice idiomatic little script.
Changing the input field separator (IFS) to parse lines is actually a
shell classic and should work on most shells (I just tested with dash),
The "declare", OTOH, is pretty Bashist. But it can be replaced by
a simple "echo":
This should be more portable (at least across the Bourne family):
oldIFS="$IFS"; IFS=': '; ip -o link | while read num interface other;
do echo "$interface"; done; IFS="$oldIFS"
Cheers
- -- tomás
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=nic4
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