GNU Units can be used for many things. It is such a useful tool that I always install it on all Linux nodes.
Here is how I use it:
Convert network speed. ISPs and network device use bit per second, downloaders usually use byte per second.
units 1000Mbps MiB/s
; 119.21 MiB/s
units 100Mbps MiB/s
; 11.92 MiB/s
units 20Mbps MiB/s
; 2.38 MiB/s
units 4Mbps KiB/s
; 488 KiB/s
Calculate average download speed
units 800MiB/25min KiB/s
; 546.1 KiB/s
Convert hard drive space. Operating systems show GiB/TiB, while vendors use GB/TB.
units 1TB GiB
; 931.3 GiB
units 2TB GiB
; 1862.6 GiB
You can do calculation too. For example, if you have 24 16TB disks. Each data is stored in 3 replicas. At 80% capacity, you may store up to
units 16TB*24/3*0.8 TiB
; 93.13 TiB
Do time calculations
units '2 hour + 34 min + 1 day'
; 95640 s
units '2 hour + 34 min + 1 day' hour
; 26.6 hour
units 8mo weeks
; 34.8 weeks
Convert between tps and maximum possible total request per day
units 132tps req/day
; 11404800 req/day
units 132tps million*req/day
; 11.4 million*req/day
Convert between (single node) tps and average response time
units 132tps ms/req
; 7.5 ms/req
Convert foreign currency to local currency
units 39.99hkd usd
; 5.1 usd
units 500hkd/mo usd/year
; 765 usd/year
You may have notice some units are not built-in. Units allow you to define your own units very easily. Here is my ~/.units file:
word !
words 1 word
rmb !
cny rmb
RMB rmb
hkd 0.9393 rmb
aud 4.6608 rmb
usd 7.2959 rmb
eur 8.266 rmb
euro eur
gbp 9.7282 rmb
GBp 0.01gbp
jpy 0.050583 rmb
sgd 5.5781 rmb
s$ sgd
inr 0.081919 rmb
rs inr
mvr 0.4637 rmb
laari 0.01 mvr
request !
req request
r request
tps req/s
BTC 64219 usd
bitcoin 1 BTC
btc BTC
ETH 3490 usd
Ether 1 ETH
Ethereum 1 ETH
eth ETH
# units 0K tempC
# units 0K tempF
core !
jin 0.5kg
char !
share !
w 10000
yi 100000000
tx !
transaction tx
trans tx
kwh 1000*watt*hour
You can define basic unit by using ‘!’, you can define unit alias, you can define conversion. See man units for more information.