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Linux Find And Report On File Fragmentation

How do I find out badly fragmented a particular file might be under Linux operating systems?
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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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HowTo: Reload (re-read) Partition Table In Ubuntu Linux

How do I reload the partition table in Ubuntu Linux without rebooting the systems?
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Linux RAM Disk: Creating A Filesystem In RAM

Software RAM disks use the normal RAM in main memory as if it were a partition on a hard drive rather than actually accessing the data bus normally used for secondary storage such as hard disk. How do I create and store a web cache on a RAM disk to improve the speed of loading pages under Linux operating systems?
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Linux: Skip or Bypass a Fsck

Q. I know how to force fsck on the next reboot using /forcefsck file. But how do I skip or bypass a fsck on reboot? How to stop a FSCK from prompting or running automatically when rebooting server.
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