service command

I am a new CentOS Linux user. How do I change default sshd tcp port # 22 to 2022 on CentOS Linux version 5/6?

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How do I clear squid cache? How do I re-create the cache directories on a server where Squid version 3.x is currently running in Linux or Unix based server?

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I am a new Fedora Linux version 18 system administrator. How do I restart dhcpd server using command line options in Fedora Linux server running on HP server hardware?

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How do I find out if a service such as MySQL or Apache running on my Centos/RHEL/Fedora Linux server?

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I do not want to use Apache server on a CentOS / RHEL 6 server. How do I uninstall and remove Apache (HTTPD) server using command line option on Red Hat Enterprise Linux / CentOS / Fedora Linux based server?

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My iptables based firewall allows only port TCP 80 and 443. I also need tcp port # 22, but I do not have static IP at my home. How do I open and close TCP port #22 on demand under Debian or Ubuntu Linux based server systems? How do I install a port-knock server called knockd and configure it with iptables to open tcp port #22 or any other ports?

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I made changes to the httpd.conf file. How do I reload the new config changes without restarting the Apache 2 web server under Debian / CentOS Linux operating systems?

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