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portable unix way to join strings with separator

Is there a portable unix shellscripting way of joining a number of strings together with a given separator, like so: $ strjoin --- foo bar baz quux foo---bar---baz---quux Sure I could use a ...
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How to reset a tcp connection immediately on both ends on a certain condition using linux netfilter/iptables?

Dear Serverfault community, I have the following problem: I need to reset (disconnect) tcp connections on both network sides immediately if a certain string is encountered in the packet data. I don't ...
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IPtables string module

I am running 2 Apache servers behind a load balancer. I do not have access to the load balancer as it's run by our hosting provider. I am tasked with maintaining a blacklist of IP addresses that have ...