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orders(7) [netbsd man page]

ORDERS(7)					       BSD Miscellaneous Information Manual						 ORDERS(7)

NAME
orders -- orders of magnitude DESCRIPTION
The following table lists common multiples of bytes. Name Prefix Power of 2 Power of 10 Kilobyte kB 2^10 10^3 Megabyte MB 2^20 10^6 Gigabyte GB 2^30 10^9 Terabyte TB 2^40 10^12 Petabyte PB 2^50 10^15 Exabyte EB 2^60 10^18 Zettabyte ZB 2^70 10^21 Yottabyte YB 2^80 10^24 The following table lists common bit rates as a power of ten. Name Prefix Bit per second Byte per second Bit per second bit/s 1 0.125 Byte per second B/s 8 1 Kilobit per second kbit/s 10^3 125 Kilobyte per second kB/s 8 * 10^3 1000 Megabit per second Mbit/s 10^6 125000 Megabyte per second MB/s 8 * 10^6 1000000 Gigabit per second Gbit/s 10^9 125000000 Gigabyte per second GB/s 8 * 10^9 1000000000 Terabit per second Tbit/s 10^12 125000000000 Terabyte per second TB/s 8 * 10^12 1000000000000 The following table lists common orders of magnitude as a power of ten. Name Order Prefix Symbol Decimal Septillionth 10^-24 yocto y 0.000000000000000000000001 Sextillionth 10^-21 zepto z 0.000000000000000000001 Quintillionth 10^-18 atto a 0.000000000000000001 Quadrillionth 10^-15 femto f 0.000000000000001 Trillionth 10^-12 pico p 0.000000000001 Billionth 10^-9 nano n 0.000000001 Millionth 10^-6 micro mu 0.000001 Thousandth 10^-3 milli m 0.001 Hundredth 10^-2 centi c 0.01 Tenth 10^-1 deci d 0.1 One 10^0 - - 1 Ten 10^1 deca da 10 Hundred 10^2 hecto h 100 Thousand 10^3 kilo k 1000 Million 10^6 mega M 1000000 Billion 10^9 giga G 1000000000 Trillion 10^12 tera T 1000000000000 Quadrillion 10^15 peta P 1000000000000000 Quintillion 10^18 exa E 1000000000000000000 Sextillion 10^21 zetta Z 1000000000000000000000 Septillion 10^24 yotta Y 1000000000000000000000000 SEE ALSO
units(1), strsuftoll(3), number(6) STANDARDS
There have been various attempts to standardize the set of binary prefixes. Organizations such as International Electrotechnical Commission (IEC) have proposed new prefixes such as ``kibi'', ``mebi'', ``gibi'', and ``yobi'', but the adoption has been slow at best. BSD
August 6, 2011 BSD

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DF(1)							    BSD General Commands Manual 						     DF(1)

NAME
df -- display free disk space SYNOPSIS
df [-b | -h | -H | -k | -m | -P] [-ailn] [-t type] [file | filesystem ...] DESCRIPTION
The df utility displays statistics about the amount of free disk space on the specified filesystem or on the filesystem of which file is a part. Values are displayed in 512-byte per block counts. If neither a file or a filesystem operand is specified, statistics for all mounted filesystems are displayed (subject to the -t option below). The following options are available: -a Show all mount points, including those that were mounted with the MNT_IGNORE flag. -b Use 512-byte blocks rather than the default. Note that this overrides the BLOCKSIZE specification from the environment. -g Use 1073741824-byte (1-Gbyte) blocks rather than the default. Note that this overrides the BLOCKSIZE specification from the environ- ment. -H "Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte in order to reduce the number of digits to three or less using base 10 for sizes. -h "Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte in order to reduce the number of digits to three or less using base 2 for sizes. -i Include statistics on the number of free inodes. -k Use 1024-byte (1-Kbyte) blocks rather than the default. Note that this overrides the BLOCKSIZE specification from the environment. -l Only display information about locally-mounted filesystems. -m Use 1048576-byte (1-Mbyte) blocks rather than the default. Note that this overrides the BLOCKSIZE specification from the environ- ment. -n Print out the previously obtained statistics from the filesystems. This option should be used if it is possible that one or more filesystems are in a state such that they will not be able to provide statistics without a long delay. When this option is speci- fied, df will not request new statistics from the filesystems, but will respond with the possibly stale statistics that were previ- ously obtained. -P Use POSIX compliant output of 512-byte blocks rather than the default. Note that this overrides the BLOCKSIZE specification from the environment. -t Only print out statistics for filesystems of the specified types. More than one type may be specified in a comma separated list. The list of filesystem types can be prefixed with ``no'' to specify the filesystem types for which action should not be taken. For example, the df command: df -t nonfs,mfs lists all filesystems except those of type NFS and MFS. The lsvfs(1) command can be used to find out the types of filesystems that are available on the system. ENVIRONMENT
BLOCKSIZE If the environment variable BLOCKSIZE is set, the block counts will be displayed in units of that size block. BUGS
The -n and -t flags are ignored if a file or filesystem is specified. SEE ALSO
lsvfs(1), quota(1), fstatfs(2), getfsstat(2), statfs(2), getmntinfo(3), fstab(5), mount(8), quot(8) HISTORY
A df command appeared in Version 1 AT&T UNIX. BSD
May 8, 1995 BSD
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