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Linux Check Disk Space Command

I recently switched from a Windows server to a Linux server operating system. I am using Ubuntu LTS server. How do I find out disk space utilization information using command line option?
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How To See Characteristics of File Systems on Linux or Unix

How do I display the characteristics of file systems such as inodes, blocks, block size, file system name, state, lifetime writes, fsck status and more on Linux or Unix-like operating system?
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Linux: Find Out How Much Disk Space Left On Hard Drive

I am a desktop support professional with experience working in a corporate call center environment. Recently, I started to admin RHEL based IBM Linux server. How do I determine how much disk space left in my Linux server? How do I find out how much disk space I have in Linux for each partition?
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Linux WARNING: Duplicate VG name server1 LVM2 Error and Solution

I recently added SSD to my home server and reloaded the operating system. However, when I try to access my dm-crypt based old disk, I am getting the following error:

Reading all physical volumes. This may take a while...
WARNING: Duplicate VG name server01: Existing bc7YA8-eEXt-1aA1-OHTr-zJkA-ucd0-DsbRTc (created here) takes precedence over RIKiar-w3MG-Gzh5-VFWq-bkRT-9IFc-ia8k87
WARNING: Duplicate VG name server01: Existing bc7YA8-eEXt-1aA1-OHTr-zJkA-ucd0-DsbRTc (created here) takes precedence over RIKiar-w3MG-Gzh5-VFWq-bkRT-9IFc-ia8k87
Found volume group "server01" using metadata type lvm2
Found volume group "server01" using metadata type lvm2

The problem is my volume group. I set to to server01 on both old and new hard disk. How can I rename old LVM2? How do I access my old hard disk?
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Mount CD-ROM / DVD in HP-UX Unix

How do I mount CD or DVD on HP-UX Unix operating systems?
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Linux Command: Show Mounted Hard Drives Partition

How do I list or show all mounted devices in a terminal under Linux operating systems?
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Linux: Find Out What Partition a File Belongs To

How do I find out that /users/f/foo/file.txt file belongs to a specific partition? How do I find out on what partition a file exits?
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Linux: Mount Disk Partition Using LABEL

How do I mount the filesystem (disk partition) using the filesystem label on the ext3/ext4 file system located on USB disk or hard disk under Linux operating systems?
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Mount CD-ROM in Linux

How do I mount a CD-ROM or DVD drive on a Linux operating system using command line bash shell based options?
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Ubuntu: Mount The Drive From Command Line

I‘m new to Ubuntu Linux. How do I mount the hard disk drive from command line?
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