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04_2__Interlude_Using_JQ.md
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@ -21,7 +21,7 @@ _What is JQ?_ The repository explains it best, saying "jq is like sed for JSON d
In the previous section, the use of `signrawtransaction` offered an example of not being able to easily capture data into variables due to the use of JSON output: In the previous section, the use of `signrawtransaction` offered an example of not being able to easily capture data into variables due to the use of JSON output:
``` ```
$ bitcoin-cli signrawtransaction $rawtxhex $ bitcoin-cli signrawtransactionwithwallet $rawtxhex
{ {
"hex": "0200000001735dfa1584b930a78ad2c1d6db72dd2a80ae5e5d552ad97e19f1d50d41fdd6d8000000006a47304402202210ce4b2a037da02622c380278cd79fec4e0e016e66f3eb894a2dcbb9ee998f02202cac167e6abdbbf08af139fb7c6b86e9d2e58e5516cd566ae2d54953ead9923b012102111bb978a3c93a00038ae344a1a017d7fee8a9be9d0558b5793ce6f440704a96ffffffff01b0e78604000000001976a914e7c1345fc8f87c68170b3aa798a956c2fe6a9eff88ac00000000", "hex": "0200000001735dfa1584b930a78ad2c1d6db72dd2a80ae5e5d552ad97e19f1d50d41fdd6d8000000006a47304402202210ce4b2a037da02622c380278cd79fec4e0e016e66f3eb894a2dcbb9ee998f02202cac167e6abdbbf08af139fb7c6b86e9d2e58e5516cd566ae2d54953ead9923b012102111bb978a3c93a00038ae344a1a017d7fee8a9be9d0558b5793ce6f440704a96ffffffff01b0e78604000000001976a914e7c1345fc8f87c68170b3aa798a956c2fe6a9eff88ac00000000",
"complete": true "complete": true
@ -33,18 +33,18 @@ To use JQ, run `jq` at the backend of a pipe, and always use the standard invoca
To capture a specific value from a JSON object, you just list the key after the `.`: To capture a specific value from a JSON object, you just list the key after the `.`:
``` ```
$ bitcoin-cli signrawtransaction $rawtxhex | jq -r '.hex' $ bitcoin-cli signrawtransactionwithwallet $rawtxhex | jq -r '.hex'
0200000001735dfa1584b930a78ad2c1d6db72dd2a80ae5e5d552ad97e19f1d50d41fdd6d8000000006a47304402202210ce4b2a037da02622c380278cd79fec4e0e016e66f3eb894a2dcbb9ee998f02202cac167e6abdbbf08af139fb7c6b86e9d2e58e5516cd566ae2d54953ead9923b012102111bb978a3c93a00038ae344a1a017d7fee8a9be9d0558b5793ce6f440704a96ffffffff01b0e78604000000001976a914e7c1345fc8f87c68170b3aa798a956c2fe6a9eff88ac00000000 0200000001735dfa1584b930a78ad2c1d6db72dd2a80ae5e5d552ad97e19f1d50d41fdd6d8000000006a47304402202210ce4b2a037da02622c380278cd79fec4e0e016e66f3eb894a2dcbb9ee998f02202cac167e6abdbbf08af139fb7c6b86e9d2e58e5516cd566ae2d54953ead9923b012102111bb978a3c93a00038ae344a1a017d7fee8a9be9d0558b5793ce6f440704a96ffffffff01b0e78604000000001976a914e7c1345fc8f87c68170b3aa798a956c2fe6a9eff88ac00000000
``` ```
With that tool in hand, you can capture information from JSON objects to command-line variables: With that tool in hand, you can capture information from JSON objects to command-line variables:
``` ```
$ signedtx=$(bitcoin-cli signrawtransaction $rawtxhex | jq -r '.hex') $ signedtx=$(bitcoin-cli signrawtransactionwithwallet $rawtxhex | jq -r '.hex')
$ echo $signedtx $ echo $signedtx
0200000001735dfa1584b930a78ad2c1d6db72dd2a80ae5e5d552ad97e19f1d50d41fdd6d8000000006a47304402202210ce4b2a037da02622c380278cd79fec4e0e016e66f3eb894a2dcbb9ee998f02202cac167e6abdbbf08af139fb7c6b86e9d2e58e5516cd566ae2d54953ead9923b012102111bb978a3c93a00038ae344a1a017d7fee8a9be9d0558b5793ce6f440704a96ffffffff01b0e78604000000001976a914e7c1345fc8f87c68170b3aa798a956c2fe6a9eff88ac00000000 0200000001735dfa1584b930a78ad2c1d6db72dd2a80ae5e5d552ad97e19f1d50d41fdd6d8000000006a47304402202210ce4b2a037da02622c380278cd79fec4e0e016e66f3eb894a2dcbb9ee998f02202cac167e6abdbbf08af139fb7c6b86e9d2e58e5516cd566ae2d54953ead9923b012102111bb978a3c93a00038ae344a1a017d7fee8a9be9d0558b5793ce6f440704a96ffffffff01b0e78604000000001976a914e7c1345fc8f87c68170b3aa798a956c2fe6a9eff88ac00000000
``` ```
You can then use those variables easily and without error: You can then use those variables easily and without error:
``` ```
$ bitcoin-cli sendrawtransaction $signedtx $ bitcoin-cli sendrawtransactionwithwallet $signedtx
3f9ccb6e16663e66dc119de1866610cc4f7a83079bfec2abf0598ed3adf10a78 3f9ccb6e16663e66dc119de1866610cc4f7a83079bfec2abf0598ed3adf10a78
``` ```
## Use JQ to Access Single JSON Object Values in an Array by Key ## Use JQ to Access Single JSON Object Values in an Array by Key