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I had a bunch of commands fail (for example Domain expiry check) because "local" in CentOS bash doesn't have -n option:

local: -n: invalid option

I tried to find some workaround but my shell-fu isn't up to par. Any idea how to work around it or rewrite indexof() function to work without -n support?

Hi,

I'm trying to run this on CentOS and it fails because it has no ping4 command.

I find it strange that it uses ping4 to check internet availability but it later uses regular ping command for ping test. Perhaps it should be configurable or at least use the same command in both places and we can create alias for the script.

Error querying whois server: connect: Connection refused
                ⚠🚫 Warning: The domain is listed in the 'dbl.spamhaus.org' blacklist (127.255.255.254): "Error: open resolver; https://www.spamhaus.org/returnc/pub/198.41.241.17".
                ⚠🚫 Warning: The IP address (xxx.xxx.xxx.xxx) is listed in the 'zen.spamhaus.org' blacklist (127.255.255.254): "Error: open resolver; https://www.spamhaus.org/returnc/pub/198.41.241.67".

both are not true. I've checked at https://check.spamhaus.org/not_listed/?searchterm=xxx.xxx.xxx.xxx
We're not an open resolver. Never have been. The IP4 address mentioned at the end of the spamhaus URL is unknown to me.
Same goes for the zen.spamhaus check..