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The following command achieve my goal by grepping BTC price from specific exchange.
curl -sS https://api.binance.com/api/v1/ticker/price?symbol=BTCUSDT | jq -r '.price'
the output will be for the moment 7222.25000000 but i would like to get it 7222.25
Pass the price through tonumber:
curl -sS 'https://api.binance.com/api/v1/ticker/price?symbol=BTCUSDT' |
jq -r '.price | tonumber'
This would convert the price from a string to a number, removing the trailing zeros. See the manual for jq.
printf %16g so you might lose some precision and numbers above 10 quadrillion would be represented with 1e16 notation and 0.00009 as 9e-05 for instance
May 13, 2019 at 6:59
If you don't mind using a Bash builtin, printf might be the way to go:
curl -sS https://api.binance.com/api/v1/ticker/price?symbol=BTCUSDT | jq -r '.price' | xargs printf '%.2f'
This way you will keep the two trailing digits and get a rounding done as well.
xargs will run the printf binary and not the builtin.
Awk is an option also
curl -sS https://api.binance.com/api/v1/ticker/price?symbol=BTCUSDT | jq -r '.price' | awk '{printf "%.2f\n", $1}'
curltag if curl is an essential part of the problem. If you can download the file to save it on disk and runjq -r .price <myfileand get the same problem, curl isn't a necessary part of the problem.