diff --git a/sheets/awk b/sheets/awk
index 67f6a07..74b237a 100644
--- a/sheets/awk
+++ b/sheets/awk
@@ -15,3 +15,12 @@ awk -v RS='' '/42B/' file
 
 # display only first column from multi-column text
 echo "first-column  second-column  third-column" | awk '{print $1}'
+
+# Use awk solo; without the need for something via STDIN.
+awk BEGIN'{printf("Example text.\n")}'
+
+# Accessing environment variables from within awk.
+awk 'BEGIN{print ENVIRON["LS_COLORS"]}'
+
+# One method to count the number of lines; in this case, read from STDIN.
+free | awk '{i++} END{print i}'
diff --git a/sheets/find b/sheets/find
index 1723835..abe454d 100644
--- a/sheets/find
+++ b/sheets/find
@@ -1,54 +1,58 @@
-# To find files by case-insensitive extension (ex: .jpg, .JPG, .jpG):
+# Find files by case-insensitive extension (ex: .jpg, .JPG, .jpG):
 find . -iname '*.jpg'
 
-# To find directories:
+# Find directories:
 find . -type d
 
-# To find files:
+# Find files:
 find . -type f
 
-# To find files by octal permission:
+# Find files by octal permission:
 find . -type f -perm 777
 
-# To find files with setuid bit set:
+# Find files with setuid bit set:
 find . -xdev \( -perm -4000 \) -type f -print0 | xargs -0 ls -l
 
 # To find files with extension '.txt' and remove them:
 find ./path/ -name '*.txt' -exec rm '{}' \;
 
-# To find files with extension '.txt' and look for a string into them:
+# Find files with extension '.txt' and look for a string into them:
 find ./path/ -name '*.txt' | xargs grep 'string'
 
-# To find files with size bigger than 5 Mb and sort them by size:
+# Find files with size bigger than 5 Mb and sort them by size:
 find . -size +5M -type f -print0 | xargs -0 ls -Ssh | sort -z
 
-# To find files bigger thank 2 MB and list them:
+# Find files bigger thank 2 MB and list them:
 find . -type f -size +20000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'
 
-# To find files modified more than 7 days ago and list file information
+# Find files modified more than 7 days ago and list file information
 find . -type f -mtime +7d -ls
 
-# To find symlinks owned by a user and list file information
+# Find symlinks owned by a user and list file information
 find . -type l --user=username -ls
 
-# To search for and delete empty directories
+# Search for and delete empty directories
 find . -type d -empty -exec rmdir {} \;
 
-# To search for directories named build at a max depth of 2 directories
+# Search for directories named build at a max depth of 2 directories
 find . -maxdepth 2 -name build -type d
 
-# To search all files who are not in .git directory
+# Search all files who are not in .git directory
 find . ! -iwholename '*.git*' -type f
 
-# To find all files that have the same node (hard link) as MY_FILE_HERE
+# Find all files that have the same node (hard link) as MY_FILE_HERE
 find . -type f -samefile MY_FILE_HERE 2>/dev/null
 
-# To find all files in the current directory and modify their permissions
+# Find all files in the current directory and modify their permissions
 find . -type f -exec chmod 644 {} \;
 
-# To find files with extension '.txt.' and edit all of them with vim
+# Find files with extension '.txt.' and edit all of them with vim
 # vim is started only once for all files
 find . -iname '*.txt' -exec vim {} \+
 
-# To find all files with extension '.png' and rename them by changing extension to '.jpg' (base name is preserved)
+# Find all files with extension '.png' and rename them by changing extension to
+# '.jpg' (base name is preserved)
 find . -type f -iname '*.png' -exec bash -c 'mv "$0" "${0%.*}.jpg"' {} \;
+
+# Use logic and grouping to delete extension-specific files.
+find \( -iname "*.jpg" -or -iname "*.sfv" -or -iname "*.xspf" \) -type f -delete
diff --git a/sheets/stat b/sheets/stat
index 13d2dac..2d1fc94 100644
--- a/sheets/stat
+++ b/sheets/stat
@@ -1,2 +1,5 @@
 # display numerical values for file permissions
 stat -c '%a %n' *
+
+# Display only the octal permissions for the given directory. Great for tests.
+stat --format='%a' /boot