The du command reports the disk usage for the specified directory. The value reported for each sub-directory and the total are given in 1024 byte blocks.
Example:
du /lib
1
/lib/modules/2.1/fs
1
/lib/modules/2.1/net
1
/lib/modules/2.1/scsi
1
/lib/modules/2.1/block
1
/lib/modules/2.1/cdrom
1
/lib/modules/2.1/ipv4
1
/lib/modules/2.1/misc
8
/lib/modules/2.1
77
/lib/modules/2.0.22/block
55
/lib/modules/2.0.22/net
133
/lib/modules/2.0.22/scsi
321
/lib/modules/2.0.22/fs
45
/lib/modules/2.0.22/misc
635
/lib/modules/2.0.22
80
/lib/modules/2.1.5/block
58
/lib/modules/2.1.5/net
139
/lib/modules/2.1.5/scsi
335
/lib/modules/2.1.5/fs
48
/lib/modules/2.1.5/misc
664
/lib/modules/2.1.5
477
/lib/modules/2.0.30/net
974
/lib/modules/2.0.30/scsi
265
/lib/modules/2.0.30/fs
245
/lib/modules/2.0.30/cdrom
228
/lib/modules/2.0.30/misc
2195
/lib/modules/2.0.30
3503
/lib/modules
5730
/lib
This declares /lib to contain 5730, 1k (1024 byte) blocks.