Re: Check whether an IPSET already exists?

[Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>]

On Tue, 18 Nov 2008, JC Janos wrote:

> I'm writing a script to manage a number of ipsets.
> 
> How can I script (bash/perl) a check to see if:
> 
>   an IPSET exists
>   an existing IPSET is EMPTY or not

There are multiple ways to do it, even in bash ;-)

# Check that a set exists in bash:
ipset -L foo >/dev/null 2>&1
if [ $? -ne 0 ]; then
	echo "Set foo does not exist."
fi

# Check that an existing set is empty:
if [ -z "`ipset -L foo 2>/dev/null | \
	  awk '{ if (FNR == 7) print $0 }'| \
	  grep Bindings:`" ]; then
	echo "Set foo is empty."
fi

Best regards,
Jozsef
-
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