Some GNU programs (at least df, du, and ls) display sizes in
“blocks”. You can adjust the block size and method of display to
make sizes easier to read. The block size used for display is
independent of any file system block size. Fractional block
counts are rounded up to the nearest integer. The default block
size is chosen by examining the following environment variables
in turn; the first one that is set determines the block size. If
none of the above environment variables are set, the block size
currently defaults to 1024 bytes in most contexts, but this
number may change in the future. For ls file sizes, the block
size defaults to 1 byte. A block size specification can be a
positive integer specifying the number of bytes per block, or it
can be select a human-readable format. Integers may be followed
by suffixes that are upward compatible with the for decimal
multiples and with the ISO/IEC 80000-13 (formerly IEC 60027-2)
prefixes for binary multiples. With human-readable formats,
output sizes are followe