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apt-cache command

Linux: Find Out What Is Using TCP Port 80

How do I find out what is listing or using tcp port number 80 on Linux based systems using command line options?
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I'm looking for equivalent of yum info httpd command under Debian Linux. How do I display information about the installed packages on the command line under Debian or Ubuntu Linux? How do I see the description of a package under Debian or Ubuntu Linux using command line options?
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How do I find out what compilers are installed under Debian / Ubuntu / Red hat Enterprise / CentOS Linux operating systems? How do I list all available compiler packages under Linux?
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Q. I've Debian 64 bit etch server installed. This box is managed via ssh or serial console only. There is no GUI installed. How do I search for packages using apt-get under Debian or Ubuntu Linux?
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I need kernel headers to compile module and vmware tools. How do I install kernel headers on Debian or Ubuntu Linux operating systems using command line options?
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