CODE EXAMPLE FOR SHELL

linux disk usage in human readable format

# du -h /boot
2.5M    /boot/grub2/fonts
3.0M    /boot/grub2/i386-pc
5.5M    /boot/grub2
4.0K    /boot/efi/EFI/centos
8.0K    /boot/efi/EFI
12K     /boot/efi
16K     /boot/loader/entries
20K     /boot/loader
149M    /boot