M Mi K Ki G Gi
试试在各个操作系统上对文件大小单位的进制 https://physics.nist.gov/cuu/Units/binary.html
Prefixes for binary multiples
| Factor | Name | Symbol | Origin | Derivation |
|---|---|---|---|---|
| 2^10 | kibi | Ki | kilobinary: (210)1 | kilo: (103)1 |
| 2^20 | mebi | Mi | megabinary: (210)2 | mega: (103)2 |
| 2^30 | gibi | Gi | gigabinary: (210)3 | giga: (103)3 |
| 2^40 | tebi | Ti | terabinary: (210)4 | tera: (103)4 |
| 2^50 | pebi | Pi | petabinary: (210)5 | peta: (103)5 |
| 2^60 | exbi | Ei | exabinary: (210)6 | exa: (103)6 |
| one kibibit | 1 Kibit = 210 bit = 1024 bit |
|---|---|
| one kilobit | 1 kbit = 103 bit = 1000 bit |
| one byte | 1 B = 23 bit = 8 bit |
| one mebibyte | 1 MiB = 220 B = 1 048 576 B |
| one megabyte | 1 MB = 106 B = 1 000 000 B |
| one gibibyte | 1 GiB = 230 B = 1 073 741 824 B |
| one gigabyte | 1 GB = 109 B = 1 000 000 000 B |
在linux的coreutil 里同样采用了这套国际标准
https://www.gnu.org/software/coreutils/manual/coreutils.html
With human-readable formats, output sizes are followed by a size letter such as ‘M’ for megabytes. BLOCK_SIZE=human-readable uses powers of 1024; ‘M’ stands for 1,048,576 bytes. BLOCK_SIZE=si is similar, but uses powers of 1000 and appends ‘B’; ‘MB’ stands for 1,000,000 bytes.
A block size specification preceded by ‘’’ causes output sizes to be displayed with thousands separators. The LC_NUMERIC locale specifies the thousands separator and grouping. For example, in an American English locale, ‘—block-size=“‘1kB”’ would cause a size of 1234000 bytes to be displayed as ‘1,234’. In the default C locale, there is no thousands separator so a leading ‘’’ has no effect.
An integer block size can be followed by a suffix to specify a multiple of that size. A bare size letter, or one followed by ‘iB’, specifies a multiple using powers of 1024. A size letter followed by ‘B’ specifies powers of 1000 instead. For example, ‘1M’ and ‘1MiB’ are equivalent to ‘1048576’, whereas ‘1MB’ is equivalent to ‘1000000’.
A plain suffix without a preceding integer acts as if ‘1’ were prepended, except that it causes a size indication to be appended to the output. For example, ‘—block-size=“kB”’ displays 3000 as ‘3kB’.