diff --git a/cheats/misc.cheat b/cheats/misc.cheat
index b756c83..756d821 100644
--- a/cheats/misc.cheat
+++ b/cheats/misc.cheat
@@ -15,4 +15,13 @@ curl -s "wttr.in/<location>" \
 % qr code
 
 # Create a QR code with some content
-echo <content> | curl -F-=\<- qrenco.de
\ No newline at end of file
+echo <content> | curl -F-=\<- qrenco.de
+
+
+
+% json
+
+# convert JSON to YAML
+cat <json_file> | ruby -ryaml -rjson -e 'puts YAML.dump(JSON.load(ARGF))'
+
+$ json_file: find . -name '*.json'
diff --git a/cheats/osx.cheat b/cheats/osx.cheat
index 5c374c3..8be5d44 100644
--- a/cheats/osx.cheat
+++ b/cheats/osx.cheat
@@ -18,3 +18,8 @@ defaults write com.apple.finder CreateDesktop -bool true; \
 # Hide items in desktop
 defaults write com.apple.finder CreateDesktop -bool false; \
    killall Finder
+
+# Set wallpaper
+osascript -e 'tell application "Finder" to set desktop picture to POSIX file "<image_path>"'
+
+$ image_path: find $HOME -maxdepth 3 -name "*.jpg" -o -name "*.jpeg" -o -name "*.png"