Difference between revisions of "yq parser"

Latest revision as of 15:50, 23 July 2026

file name foobarr.yml contents:

webserver:
  hosts:
    foo:
      ipaddr: 192.168.1.1
      desc: "foo is cool"
    bar:
      ipaddr: 10.0.0.1
      desc: "bar is cooler"

$ yq '.webserver.hosts[] | select(.ipaddr == "192.168.1.1")'  foobar.yml

{
 "ipaddr": "192.168.1.1"
}yq '.webserver.hosts[] | select(.ipaddr == "192.168.1.1")'  foobar.yml

pass an arg

$ yq --arg IPADDR "$ipaddr" '.webserver.hosts[] | select(.ipaddr == "192.168.1.1")' foobar.yml
{
 "ipaddr": "192.168.1.1",
 "desc": "foo"
}

show only keys

 $ yq '.webserver.hosts | keys | .[]' foobar.yml
"bar"
"foo"

csv of key + ipaddr (without quotes), use the -r (--raw-output) option:

$ yq -r '.webserver.hosts | to_entries[] | "\(.key),\(.value.ipaddr)"' foobar.yml
foo,192.168.1.1
bar,10.0.0.1

@@ Line 1: / Line 1: @@
-file contents:
+file name foobarr.yml contents:
 <source lang="yaml">
 webserver:
@@ Line 5: / Line 5: @@
      foo:
        ipaddr: 192.168.1.1
-       desc: "foo"
+       desc: "foo is cool"
      bar:
        ipaddr: 10.0.0.1
-       desc: "bar"
+       desc: "bar is cooler"
 </source>
-  $ '''yq '.fg.hosts[] | select(.ipaddr == "192.168.1.1")' devices_test.yaml'''
+  $ '''yq '.webserver.hosts[] | select(.ipaddr == "192.168.1.1")'  foobar.yml'''
   {
-   "ipaddr": "10.128.1.98"
+   "ipaddr": "192.168.1.1"
+ }yq '.webserver.hosts[] | select(.ipaddr == "192.168.1.1")'  foobar.yml
+pass an arg
+ $ '''yq --arg IPADDR "$ipaddr" '.webserver.hosts[] | select(.ipaddr == "192.168.1.1")' foobar.yml'''
+ {
+  "ipaddr": "192.168.1.1",
+  "desc": "foo"
   }
+show only keys
+  $ '''yq '.webserver.hosts | keys | .[]' foobar.yml'''
+ "bar"
+ "foo"
+csv of key + ipaddr (without quotes), use the -r (--raw-output) option:
+ $ '''yq -r '.webserver.hosts | to_entries[] | "\(.key),\(.value.ipaddr)"' foobar.yml'''
+ foo,192.168.1.1
+ bar,10.0.0.1