This question already has an answer here:
I would like to get individual file size, all used file size in the disk and usable the maximum file size in the disk. In linux, commands for checking file sizes such as "du", "df", "ls -l" are prepared.
However, the result is different when examining the total size of the files used in "df -h" and when examining the total size of the file used in "du -shc /*".
result of df,
$df -h Filesystem Size Used Avail Use% Mounted on ubi0:rootfs 435M 195M 240M 45% / devtmpfs 88M 4.0K 88M 1% /dev tmpfs 248M 168K 248M 1% /run tmpfs 248M 124K 248M 1% /var/volatile
result of du,
$du -shc /* 3.3M /bin 1.2M /boot 4.0K /dev 5.5M /etc 38M /home 9.7M /lib 0 /media 0 /mnt 12K /opt 0 /proc 168K /run 2.5M /sbin 0 /sys 0 /tmp 45M /unit_tests 273M /usr 228M /var 36K /www 605M total
Which command shows the exact file size? Or, what other command can be executed to obtain the correct file size?