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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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Debian / Ubuntu: Find Information ( Description ) About Installed Packages

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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Linux Find Out What Compilers Are Installed or Available On The System

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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Debian / Ubuntu: Search For Packages Using Apt Command Line

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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Debian / Ubuntu Linux Install Kernel Headers Package

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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