root user

How do I add a user to group under Ubuntu Linux operating system using command line options?

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I‘m a new Linux user. How do I shutdown Linux based system using command line options?

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I‘m using rsnapshot filesystem snapshot utility to make incremental snapshots of local and remote filesystems for 10 production servers running on RHEL 5.x system. The rsnapshot commands makes extensive use of hard links,

so if the file doesn’t change, the next snapshot is simply a hard link to the exact same file. How do I use the rsync command to copy my the entire snapshot directory /raid6/rsnapshot (around 4TB) to a remote server?

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How do I list all hard disk partitions under Linux operating systems?

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A dot-file is generally any file whose name begins with a full stop. In Linux or Unix like operating system it is also called as hidden file. How do I list all dot files in my home directory?

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