sysctl with regex?
olli at lurza.secnetix.de
Wed Feb 10 10:51:58 UTC 2010
Andrew Brampton wrote:
> Today I was writing a script to read all the dev.cpu.?.temperature
> sysctl OIDs. I was parsing them using a simple grep, but it occurred
> to me it might be better if sysctl supported some form of regexp. For
> example instead of typing:
> sysctl -a | grep dev.cpu.*.temperature
> I could write:
> sysctl dev.cpu.*.temperature
> which would display all the OIDs that match dev.cpu.*.temperature.
> This is better than grep because when I issue a "sysctl -a" the
> program retrieves many variables that I am not interested in (which
> later get filtered by grep).
I'm not sure such a feature is really necessary.
What's wrong with this approach?
$ sysctl dev.cpu | grep temperature
When you need that in a script, there's an even more
elegant way to do it:
NCPU=`sysctl -n hw.ncpu`
OIDS=`jot -w dev.cpu.%d.temperature $NCPU 0`
There's no need to use "sysctl -a". After all, the
"UNIX way" of doing things is to combine the existing
tools instead of duplicate features in many tools.
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