@Dona, Linux administrators are back-end IT specialists who install, configure, and maintain Linux operating systems in a variety of organizations. This role involves server-side operations and troubleshooting tasks that support business-critical and development activities. Linux administrators also configure user access and monitor system stability and security through deployment and everyday use. Some of the responsibilities of a Linux Administrator are:
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Install and Configure Linux Systems 
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Perform System Maintenance 
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Create System Backups 
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Monitor System Performance 
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Provide Technical Support and Guidance 
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Maintain System Security