Add quotes to variables in script

episodes/04-loops.md

@@ -138,12 +138,13 @@ Alternatively, rather than running the loop above on the command line, you can s
 
 ```
 #!/bin/bash
-# This script loops through .txt files, returns the file name, first line, and last line of the file
+# This script loops through .txt files, returns the file name,
+# first line, and last line of the file
 for file in *.txt
 do
-	echo $file
-	head -n 1 $file
-	tail -n 1 $file
+	echo "$file"
+	head -n 1 "$file"
+	tail -n 1 "$file"
 done
 ```
 

episodes/files/my_first_bash_script.sh

@@ -1,8 +1,10 @@
 #!/bin/bash
+# This script loops through .txt files, returns the
+# file name, first line, and last line of the file
 
-for filename in *.txt
+for file in *.txt
 do
- echo $filename
- head -n 5 $filename
- tail -n 5 $filename
-done
+ echo "$file"
+ head -n 1 "$file"
+ tail -n 1 "$file"
+done