diff --git a/atproto.md b/atproto.md
index 76320a6..e65b3cf 100644
--- a/atproto.md
+++ b/atproto.md
@@ -36,6 +36,49 @@ url=$api/com.atproto.repo.getRecord
 curl -sL "$url?repo=$did&collection=$collection&rkey=$rkey&cid="|jq .
 ```
 
+## jq
+
+ここでは[aios](https://git.syui.ai/ai/os)にインストールされている[jq](https://github.com/jqlang/jq), [dasel](https://github.com/TomWright/dasel)の`example`をまとめます。
+
+## null
+
+`id:3`の`name:null`を除外して表示
+
+```json
+[
+  {
+    "id": 1,
+    "name": "aios",
+    "display": "ai os"
+  },
+  {
+    "id": 2,
+    "name": "archlinux",
+    "display": "Arch Linux"
+  },
+  {
+    "id": 3,
+    "display": "Linux Kernel"
+  }
+]
+```
+
+```sh
+$ echo $json|jq -r ".[]|{name, display}|select(.name | length > 0)|.name,.display"
+aios
+ai os
+archlinux
+Arch Linux
+```
+
+```sh
+$ echo $json|jq -r ".[]|.name // empty"
+aios
+archlinux
+```
+
+## dasel
+
 - https://daseldocs.tomwright.me
 
 ```sh