diff --git a/solutions.ipynb b/solutions.ipynb
index 10ae56f..df898ad 100644
--- a/solutions.ipynb
+++ b/solutions.ipynb
@@ -22,7 +22,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: echo \"Hello World\""
    ]
   },
   {
@@ -38,7 +38,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: mkdir new_dir"
    ]
   },
   {
@@ -54,7 +54,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: rm -r new_dir/"
    ]
   },
   {
@@ -70,7 +70,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: echo \"Hello World\""
    ]
   },
   {
@@ -86,7 +86,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: mkdir new_dir"
    ]
   },
   {
@@ -102,7 +102,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: rm -r new_dir/"
    ]
   },
   {
@@ -118,7 +118,9 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: \n",
+    "mkdir lorem-copy\n",
+    "cp lorem/sed.txt lorem-copy"
    ]
   },
   {
@@ -134,7 +136,16 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: cp lorem/at.txt lorem-copy ; cp lorem/lorem.txt lorem-copy"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "Other option: cp lorem/{at.txt,lorem.txt} lorem-copy"
    ]
   },
   {
@@ -150,7 +161,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: cat lorem/sed.txt"
    ]
   },
   {
@@ -166,7 +177,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: cat lorem/{at.txt,lorem.txt}"
    ]
   },
   {
@@ -182,7 +193,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: head --lines=3 lorem-copy/sed.txt"
    ]
   },
   {
@@ -198,7 +209,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: tail --lines=3 lorem-copy/sed.txt"
    ]
   },
   {
@@ -214,7 +225,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: echo \"Homo homini lupus\" >> lorem-copy/sed.txt"
    ]
   },
   {
@@ -230,7 +241,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: tail --lines=3 lorem-copy/sed.txt"
    ]
   },
   {
@@ -246,7 +257,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: sed -i -e 's/et/ET/g' lorem-copy/at.txt"
    ]
   },
   {
@@ -262,7 +273,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: whoami"
    ]
   },
   {
@@ -278,7 +289,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: pwd"
    ]
   },
   {
@@ -294,7 +305,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: cd lorem ; ls *.txt"
    ]
   },
   {
@@ -310,7 +321,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: wc -l lorem/sed.txt"
    ]
   },
   {
@@ -326,7 +337,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: find . -name \"lorem*\" -type f | wc -l"
    ]
   },
   {
@@ -342,7 +353,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: grep --color=always \"et\" lorem/at.txt"
    ]
   },
   {
@@ -358,7 +369,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: grep -o \"et\" lorem/at.txt | wc -l"
    ]
   },
   {
@@ -374,7 +385,24 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: grep -roh -i \"et\" lorem-copy/ | wc -l"
+   ]
+  },
+  {
+   "cell_type": "raw",
+   "metadata": {},
+   "source": [
+    "The command: grep -roh \"et\" lorem-copy/ | wc -l"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# The first one considers the capitalized ET in at.txt (-i ignores case)\n",
+    "# The second one only considers \"et\""
    ]
   },
   {
@@ -397,7 +425,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: name=\"marc\""
    ]
   },
   {
@@ -413,7 +441,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: echo $name"
    ]
   },
   {
@@ -429,7 +457,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: mkdir $name"
    ]
   },
   {
@@ -445,7 +473,7 @@
    "cell_type": "raw",
    "metadata": {},
    "source": [
-    "The command:"
+    "The command: rm -r marc/"
    ]
   },
   {