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Bourne Shell Exit Status Examples

Can you explains and provide us "Bourne Shell Exit Status Code" examples?
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My CentOS Apache 2 (httpd) webserver will not start. It was working fine but I made few changes to httpd.conf and it is not restarting. What are some things to check in order to solve my issues?
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Test Iptables Script Remotely

How do I test iptables based script remotely over ssh session? How do I avoid lock outs?
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