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Ubuntu Linux: Add a User To Group

How do I add a user to group under Ubuntu Linux operating system using command line options?
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How do I change passwords for specific user account under Linux operating systems using command line?
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HowTo: Shutdown Linux System

I'm a new Linux user. How do I shutdown Linux based system using command line options?
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Linux: Show The Groups a User Is In

How do I find out what groups I belong to under Linux operating systems?
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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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HowTo: Linux List Disk Partitions Command

How do I list all hard disk partitions under Linux operating systems?
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Linux / Unix: Bash Find Matching All Dot Files

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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