%kThe amount of disk space used for this file in 1K blocks. Since disk space is allocated in multiples of the filesystem block size this is usually greater than %s/1024, but it can also be smaller if the file is a sparse file (that is, it has “holes”).
%bThe amount of disk space used for this file in 512-byte blocks. Since disk space is allocated in multiples of the filesystem block size this is usually greater than %s/512, but it can also be smaller if the file is a sparse file (that is, it has “holes”).
%sFile’s size in bytes.
%SFile’s sparseness. This is calculated as (BLOCKSIZE*st_blocks /
st_size). The exact value you will get for an ordinary file of a
certain length is system-dependent. However, normally sparse files
will have values less than 1.0, and files which use indirect blocks
and have few holes may have a value which is greater than 1.0. The
value used for BLOCKSIZE is system-dependent, but is usually 512
bytes. If the file size is zero, the value printed is undefined. On
systems which lack support for st_blocks, a file’s sparseness is
assumed to be 1.0.