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qemu:tldr:74c75
The command "qemu-system-x86_64 -hda ${image_name-img}" is used to run a virtual machine on a computer using QEMU (Quick EMUlator). Here's an explanation of each part of the command:
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"qemu-system-x86_64": This is the executable command used to start QEMU for x86_64 architecture, which emulates a 64-bit x86 processor.
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"-hda": This is an option that specifies the virtual hard disk image file to be used as the primary hard disk for the virtual machine.
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"${image_name-img}": This is a placeholder for the actual image file name. The format "${variable_name}" is often used in command lines to represent a variable that should be replaced with the appropriate value.
For example, if the image file name is "ubuntu.img", the actual command would be: "qemu-system-x86_64 -hda ubuntu.img".
This command starts QEMU and launches a virtual machine with the specified image file as its primary hard disk. The virtual machine will run as if it has its own independent operating system, allowing you to execute, test, and experiment with software in a controlled virtual environment.