How to Check Filesystem Block Size on Linux?

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How to Check Filesystem Block Size on Linux?
Example 1:
# tune2fs -l /dev/sda1 | grep -i ‘block size’
Block size: 4096
Example 2:
# dumpe2fs -h /dev/sda1 |grep “Block size:”
Block size: 4096
Example 3:
# blockdev –getbsz /dev/sda1
4096
Example 4:
# echo “abc” >test.txt
# du -h test.txt
4.0K test