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How to use resize2fs, what is the purpose?

Answer:

resize2fs is only for ext2 filesystem but not ext3.
first unmount the partition
#umount /dev/sda1

#tune2fs -O ^has_journal /dev/sda1 #to remove journal from /dev/sda1

#e2fsck -f /dev/sda1

#resize2fs /dev/sda1 600M #resize the partition

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What is the diff between ext3 and ext2 File system?If the FS is in read-only mode, so we cannot create any file. How will you fix it?