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?


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


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?


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


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?


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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