diff --git a/sheets/convert b/sheets/convert
index 4342c05..57bdd9e 100644
--- a/sheets/convert
+++ b/sheets/convert
@@ -1,24 +1,21 @@
-# To resize an image to a fixed width and proportional height:
+# Resize an image to a fixed width and proportional height:
 convert original-image.jpg -resize 100x converted-image.jpg
 
-# To resize an image to a fixed height and proportional width:
+# Resize an image to a fixed height and proportional width:
 convert original-image.jpg -resize x100 converted-image.jpg
 
-# To resize an image to a fixed width and height:
+# Resize an image to a fixed width and height:
 convert original-image.jpg -resize 100x100 converted-image.jpg
 
-# To resize an image and simultaneously change its file type:
+# Resize an image and simultaneously change its file type:
 convert original-image.jpg -resize 100x converted-image.png
 
-# To resize all of the images within a directory:
-# To implement a for loop:
-for file in `ls original/image/path/`;
-    do new_path=${file%.*};
-    new_file=`basename $new_path`;
-    convert $file -resize 150 conerted/image/path/$new_file.png;
+# Resize all of the images within a directory, using a for loop:
+for file in original/image/path/*; do
+    convert "$file" -resize 150 converted/image/path/"$file"
 done
 
-# Make text annotatation (text = Flower)
+# Make text annotation (text = Flower)
 convert flower.jpg -font courier -fill white -pointsize 20 -annotate +50+50 'Flower' flower_annotate1.jpg
 
 # Crop an image
@@ -33,3 +30,5 @@ convert -border 1x1 -bordercolor "#FFFFFF" image.png new-image.png
 # Convert PNG to JPEG (with 70% quality)
 convert -quality 70 image.png new_image.jpg
 
+# Apply vignette and grayscale effects to all JPGs in the CWD, using a for loop.
+for FILE in *.jpg; { convert -background black -colorspace gray -vignette 200x100 "$FILE" "$FILE"; }
diff --git a/sheets/find b/sheets/find
index abe454d..81e089f 100644
--- a/sheets/find
+++ b/sheets/find
@@ -56,3 +56,6 @@ 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
+
+# List all executable files, by basename, found within PATH.
+find ${PATH//:/ } -type f -executable -printf "%P\n"
diff --git a/sheets/nl b/sheets/nl
new file mode 100644
index 0000000..b82cd57
--- /dev/null
+++ b/sheets/nl
@@ -0,0 +1,7 @@
+# Number lines given to `nl` via STDIN.
+printf "Here\nis\nsome\nexample\ntext." | nl
+
+# Number (all) lines given to `nl` via provided file(s).
+nl -b a /path/to/file
+# The above can also be achieved with `cat`, which is perhaps more portable:
+cat -n /path/to/file
diff --git a/sheets/sed b/sheets/sed
new file mode 100644
index 0000000..3ebd5a4
--- /dev/null
+++ b/sheets/sed
@@ -0,0 +1,2 @@
+# Edit a file, via substitution, in-place; changes are made to the file(s).
+sudo sed -i 's/Name=Xfce Session/Name=Xfce_Session/' /usr/share/xsessions/xfce.desktop
diff --git a/sheets/xargs b/sheets/xargs
index b9571f0..f329873 100644
--- a/sheets/xargs
+++ b/sheets/xargs
@@ -1,13 +1,17 @@
-# find all file name ending with .pdf and remove them
+# Find all file names ending with .pdf and remove them
 find -name \*.pdf | xargs rm
+# The above, however, is preferable written without xargs:
+find -name \*.pdf -exec rm {} \+
+# Or, for find's own functionality, it's best as:
+find -name \*.pdf -delete
 
-# find all file name ending with .pdf and remove them
+# Find all file name ending with .pdf and remove them
 # (bulletproof version: handles filenames with \n and skips *.pdf directories)
 # -r = --no-run-if-empty
 # -n10 = group by 10 files
 find -name \*.pdf -type f -print0 | xargs -0rn10 rm
 
-# if file name contains spaces you should use this instead
+# If file name contains spaces you should use this instead
 find -name \*.pdf | xargs -I{} rm -rf '{}'
 
 # Will show every .pdf like:
@@ -15,6 +19,8 @@ find -name \*.pdf | xargs -I{} rm -rf '{}'
 #	&titi.pdf=
 # -n1 => One file by one file. ( -n2 => 2 files by 2 files )
 find -name \*.pdf | xargs -I{} -n1 echo '&{}='
+# The above is, however, much faster and easier without xargs:
+find -name \*.pdf -printf "%p\n"
 
-# group words by three in a string
-seq 1 10 | xargs -n3 echo
+# Group words by three in a string
+seq 1 10 | xargs -n3