I want to use curl to PUT data. This works:
curl -X PUT --data '{ "xy": [0.6476, 0.2727] }' "http://"
I have a couple of bash variables that I'd like to use in place of the literals:
$key="xy"
$value="[0.6476, 0.2727]"
I've tried replacing the literals with quoted vars, but I get an error 'parameter not available'. I've tried combinations of nested and escaped quotes, but I am not getting anywhere.
Well this works for me :
$ key='foo'
$ value='[ bar, bar ]'
$ echo "{ \"$key\": $value }"
{ "foo": [ bar, bar ] }
So this should work for you as well :
curl -X PUT --data "{ \"$key\": $value }" "http://google.com.uy"
Let me know if it helps!
This works for me with Node:
key="xy"
value="[0.6476, 0.2727]"
jsonData=$(node -e "console.log(JSON.stringify({$key: $value}))")
#jsonData output is: {"xy":[0.6476,0.2727]}
curl -X PUT --data $jsonData "http://"
But this only works for Node.js Developer or you have Node environment installed.
Using jq (1.6 or later), use the --jsonargs option to take multiple JSON-encoded values as a JSON array accessible via $ARGS.positional:
$ key=xy
$ value=(0.6476 0.2727)
$ jq -n '{($k): $ARGS.positional}' --arg k "$key" --jsonargs "${value[@]}"
{
"xy": [
0.6476,
0.2727
]
}
--jsonargs must come last, so that all remaining arguments are treated as values in the desired array. We use --jsonargs rather than --args so that you get an array of floating-point values, rather than an array of strings.
Once you have jq working, you pipe its output to curl, which uses - as the argument to --data to read the data from the pipe.
jq -n '{($k): $ARGS.positional}' --arg k "$key" --jsonargs "${value[@]}" |
curl -X PUT --data - "http://"
$k to be evaluated as an expression, rather than an ill-formed literal key. $ARGS.positional is an expression that evaluates to an array containing all the arguments that follow the --args option.value is set to a string containing the array I need to send (per my question), so my jsonargs part is --jsonargs "[nnn, nnn]" which is outputting [[nnn nnn]]. How can I get rid of that extra pair of square brackets please?
jq1.6 for accessing positional arguments tojqas a list.curl