Fix lists in cheat sheet

Notebooks/Unix/cheat_sheet/unix_cheat_sheet.ipynb

@@ -169,24 +169,29 @@
     "## Which tool should I use?\n",
     "\n",
     "You should probably use awk if:\n",
+    "\n",
     "* your data has columns\n",
     "* you need to do simple maths\n",
     "\n",
     "You should probable use grep if:\n",
+    "\n",
     "* you're looking for files which contain some specific text (e.g. `grep -r foo bar/`: look in all the files in `bar/` for any with the word 'foo')\n",
     "\n",
     "You should use find if:\n",
+    "\n",
     "* you know something about a file (like it's name or creation date) but not where it is\n",
     "* you want a list of all the files in a subdirectory and its subdirectories etc.\n",
     "\n",
     "You should write a script if:\n",
+    "\n",
     "* your code doesn't fit on one line\n",
     "* it's doing something you might want to do again in 3 months\n",
     "* you want someone else to be able to do it without asking loads of questions\n",
     "* you're doing something sensitive (e.g. deleting loads of files)\n",
     "* you're doing something lots of times\n",
     "\n",
     "You should probably use less or head:\n",
+    "\n",
     "* always, you should always use less or head to check intermediary steps in your analysis\n"
    ]
   }