fix indentation

Notebooks/Unix/bash_scripts/bash_scripts.ipynb

@@ -245,7 +245,7 @@
     "A basic check for this script would be to verify that two options were supplied, and if not then print a help message. The code looks like this:\n",
     " \n",
     "    if [ $# -ne 2 ]\n",
-    "        then\n",
+    "    then\n",
     "            echo \"usage: options_example.3.sh filename number_of_lines\"\n",
     "            echo\n",
     "            echo \"Prints the filename, and the given first number of lines of the file\"\n",