[disappearing.sh]: Add disappearing.sh

src/disappearing.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+# Script that deletes its source code while executing and replaces it when exiting, hence "disappearing" while running and re-appearing once finished
+
+file_contents=$(cat "$0")
+rm "$0"
+
+for i in $(seq 1 10); do
+    echo "Doing something invisible"
+    sleep 1
+done
+
+echo "$file_contents" > "$0"