flywithu/Learning-Bitcoin-from-the-Command-Line
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Fix bc error with scientific numbers in txfee_calc

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Cryp Toon 2024-03-25 21:03:14 +01:00
parent 9b97c50471
commit 2118d06300
2 changed files with 2 additions and 2 deletions
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2
04_2__Interlude_Using_JQ.md
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@ -372,7 +372,7 @@ $ usedtxid=($(bitcoin-cli decoderawtransaction $rawtxhex | jq -r '.vin | .[] | .
$ usedvout=($(bitcoin-cli decoderawtransaction $rawtxhex | jq -r '.vin | .[] | .vout'))
$ btcin=$(for ((i=0; i<${#usedtxid[*]}; i++)); do txid=${usedtxid[i]}; vout=${usedvout[i]}; bitcoin-cli listunspent | jq -r '.[] | select (.txid | contains("'${txid}'")) | select(.vout | contains('$vout')) | .amount'; done | awk '{s+=$1} END {print s}')
$ btcout=$(bitcoin-cli decoderawtransaction $rawtxhex | jq -r '.vout [] | .value' | awk '{s+=$1} END {print s}')
$ echo "$btcin-$btcout"| /usr/bin/bc
$ echo $(printf '%.8f-%.8f' $btcin $btcout_f) | /usr/bin/bc
.255
```
And that's also a good example of why you double-check your fees: we'd intended to send a transaction fee of 5,000 satoshis, but sent 255,000 satoshis instead. Whoops!

2
src/04_2_i_txfee-calc.sh
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@ -11,4 +11,4 @@ usedvout=($(bitcoin-cli decoderawtransaction $1 | jq -r '.vin | .[] | .vout'))
btcin=$(for ((i=0; i<${#usedtxid[*]}; i++)); do txid=${usedtxid[i]}; vout=${usedvout[i]}; bitcoin-cli listunspent | jq -r '.[] | select (.txid | contains("'${txid}'")) | select(.vout | contains('$vout')) | .amount'; done | awk '{s+=$1} END {print s}')
btcout=$(bitcoin-cli decoderawtransaction $1 | jq -r '.vout [] | .value' | awk '{s+=$1} END {print s}')
btcout_f=$(awk -v btcout="$btcout" 'BEGIN { printf("%f\n", btcout) }' </dev/null)
echo "$btcin-$btcout_f"| /usr/bin/bc
echo $(printf '%.8f-%.8f' $btcin $btcout_f) | /usr/bin/bc