diff --git a/kernel/guest-setup/fedora.sh b/kernel/guest-setup/fedora.sh
index 8870a58af..cadf41b8a 100644
--- a/kernel/guest-setup/fedora.sh
+++ b/kernel/guest-setup/fedora.sh
@@ -80,7 +80,7 @@ sudo dnf install python3-pip
 
 pip install pre-commit tmuxp
 
-sudo dnf install -y fd-find sysstat
+sudo dnf install -y fd-find sysstat ipython
 
 # npm install @lint-md/cli@beta
 #
diff --git a/sheet.md b/sheet.md
index caa23ef50..5ec3f9681 100644
--- a/sheet.md
+++ b/sheet.md
@@ -201,3 +201,10 @@ rg -l blk_update_request
 ## wget
 递归拷贝:
 https://stackoverflow.com/questions/273743/using-wget-to-recursively-fetch-a-directory-with-arbitrary-files-in-it
+
+
+## fd
+fd 使用的是 regex
+```sh
+fd ".*\.md" | wc -l
+```