I have a JSON object where the relevant parts are of the form
{
"_meta": {
"hostvars": {
"name_1": {
"ansible_host": "10.0.0.1"
},
"name_2": {
"ansible_host": "10.0.0.2"
},
"name_3": {
"ansible_host": "10.0.0.3"
}
}
},
...
"nodes": {
"hosts": [
"name_1",
"name_2"
]
}
}
(the output of ansible-inventory --list, for reference).
I would like to use jq to produce a list of IPs of the nodes hosts by looking up the names in ._meta.hostvars. In the example, the output should be:
10.0.0.1
10.0.0.2
Note that 10.0.0.3 should not be included because name_3 is not in the .nodes.hosts list. So just doing jq -r '._meta.hostvars[].ansible_host' doesn't work.
I've tried jq '.nodes.hosts[] | ._meta.hostvars[.].ansible_host' but that fails because ._meta doesn't scan from the root after the pipe.
You can store the root in a variable before changing the context:
jq -r '. as $root | .nodes.hosts[] | $root._meta.hostvars[.].ansible_host'
But a better solution is to just inline the "hosts" query:
jq -r '._meta.hostvars[.nodes.hosts[]].ansible_host'
Related
Can I output the ip and source id only when source id is duplicate it should out put all ip in one array if no duplicate ip can be output with corresponding source id
{"ip":"192.134.5.31","access_key":"223434354656767","source_id":"2e74a68a-2fef-443544-815d-87"}
{"ip":"172.23.54.4","saccess_key":"223434354656767","source_id":"2e74a68a-2fef-443544-815d-87"}
{"ip":"182,555,44.44","access_key":"223434354656767","source_id":"2e74a68a-2fef-443544-815d-222"}
I dont care about access key here also if this access key can be done with Jq would be great
unique_by(.ip) |{ip.source_id[]}
.ip| select(.source_id[])
You should group_by to group all the matching source_id.
Then you can create the desired output, for example:
group_by(.source_id)[] | { ip: map(.ip), source_id: (first.source_id) }
Will output:
{
"ip": [
"182,555,44.44"
],
"source_id": "2e74a68a-2fef-443544-815d-222"
}
{
"ip": [
"192.134.5.31",
"172.23.54.4"
],
"source_id": "2e74a68a-2fef-443544-815d-87"
}
Since
We group on source_id
We create an object for each group, containing
An map() from all the lower ip's and the source_id taken from the first object
Use the --slurp option to combine those objects in to an array:
jq --slurp 'group_by(.source_id)[] | { ip: map(.ip), source_id: (first.source_id) }'
JqPlay Demo
I'm not sure what your expected output is, but if you are trying to group IPs by source id like such:
{
"2e74a68a-2fef-443544-815d-222": [
"182,555,44.44"
],
"2e74a68a-2fef-443544-815d-87": [
"192.134.5.31",
"172.23.54.4"
]
}
Then you can group by your source_id and then transform the output:
group_by(.source_id) | map({(.[0].source_id): map(.ip)}) | add
Or by using a custom function:
def group(k): group_by(k) | map({key:first|k, value:.}) | from_entries;
group(.source_id) | map_values(map(.ip))
or
def group(k;v): group_by(k) | map({key:first|k, value:map(v)}) | from_entries;
group(.source_id;.ip)
I'm trying to get this output the device name "test"
My filter is .[] | [.deviceName] and it's returning error: (at :7): Cannot index array with string "deviceName"
{
"test": [
{
"deviceName": "test",
"monitoringServer": "server1"
}
]
}
Presumably you meant:
jq '.test[] | [.deviceName]'
or perhaps:
jq '.[][] | [.deviceName]'
but without knowing your requirements, it's hard to say. That's one of the reasons why the http://stackoverflow.com/help/mcve guidelines were formulated.
I know StackOverflow is not a code-writing-service, but sed has been driving me crazy for the past 3 hours.
In summary, I need to modify the contents of a .json file that I have.
What the file looks like:
{
// ...
"first": {
"second": [
"indexZero",
"theseStringsAreDynamic",
"soINeedToUseWildcard"
]
}
// ...
}
Desired result:
{
// ...
"first": {
"second": [
]
}
// ...
}
What have you done?
I have tried about a million variations loosely based upon:
sed -i 's/\"second\": \[.*\]/\"second\": []/' "my.json"
## ~ Which gives: ~
#
# "first": {
# "second": []
# "indexZero",
# "theseStringsAreDynamic",
# "soINeedToUseWildcard"
# ]
# },
Essentially, I need to remove all elements from an array in a .json file, so if sed is not the correct tool for the job, please let me know.
Thank you for your time.
The correct tool for the job is jq:
$ jq '.first.second = []' input.json
{
"first": {
"second": []
}
}
To replace the original file, it's a two step process - redirect output to a temporary file and then rename it:
jq '.first.second = []' orig.json > tmp.json && mv -f tmp.json orig.json
I need help in correcting jq test cases syntax. Following is output file & trying to test ID list with command below. Gives error index to string type.
[[ $(echo $output| jq -r '.output.value[] | select(.identity).id_list') == *"id2"* ]]
output = {
"resource_output": {
"value": {
"identity": [
{
"id_list": [
"/subscriptions/---/id1",
"/subscriptions/---/id2",
"/subscriptions/--/id3"
],
"principal_id": "",
"tenant_id": "",
"type": "managed"
}
]
}
}
Your query does not match the sample JSON, and you have not indicated what output you are expecting, but the following variation of your query illustrates how to use select and test with your data along the lines suggested by your attempt:
echo "$output" |
jq -r '.resource_output.identity[].id_list[] | select(test("id2"))'
Output:
/subscriptions/---/id2
Input:
{
"name":"JSON",
"good":true,
"target":"yes"
}
{
"name":"XML",
"good":false
}
I would like to exclude object WITHOUT key "target", as follow but NOT has:
jq -r ".| select(has(\"target\"))"
expected output:
{
"name":"XML",
"good":false
}
tried this:
jq -r " . | del(select(has(\"target\")))"
but there are two returned objects, one of them NULL
null
{
"good": false,
"name": "XML"
}
Select those who do not have target; that way, you do not use del:
jq -r 'select(has("target") | not)'