less command

I am a new Unix system admin. How do I find ouw who has recently use the Linux or Unix-like server? Which terminals they used, and when they logged in and out of the my server?

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How do I see a list of all exported variables and functions under Unix bash shell?

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OpenGL (Open Graphics Library) is a standard specification defining a cross-language, cross-platform API for writing applications that produce 2D and 3D computer graphics. How can I test if my graphics card has OpenGL support under Linux?

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How do I view currently setup or all running cron jobs under Linux operating systems?

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I can use less or more pagers to view a file. How do I start an editor (such as vi or other text editor) to edit the current file without leaving the less or more pager command?

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Q. I’m using CentOS on 64 bit Linux. How do I find out rpm package architecture before installation such as i386 or x86_64 bit? A. Almost each rpm package has i386 or x86_64 added to file extension. However some time you may see filename such as file-version.rpm. You can list all installed rpm packages with […]

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