On 2012-11-16 06:07, Edward Ned Harvey (lopser) wrote:
Thanks for suggestions everyone. This is the best solution because it's
clearly understandable and readable, doesn't have any external dependencies
(like possibly unavailable or varying versions of perl/awk/sed/python)
PERM=`stat -c '%a' /etc/resolv.conf`
let OWRITABLE="8#$PERM & 8#002"
let GWRITABLE="8#$PERM & 8#020"
if [ $OWRITABLE -ne 0 -o $GWRITABLE -ne 0 ] ; then
...
fi
I agree that it is preferable to use bash (or whatever shell you are using)
over an external apps if it can do it, but would like to point out that:
-bash is not static, it is evolving, and online documentation tends to be for
the latest version. When you write a script, it is important to make sure it
works for the oldest version of bash you have out of all your targets.
-I believe bc and dc syntax has been fairly static for the past few decades!
They are powerful tools, I think people don't tend to use them mainly because
they have forgotten about them.
--
Yves. http://www.SollerS.ca/
http://ipv6.SollerS.ca
http://blog.zioup.org/
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