diff --git a/LDP/guide/docbook/abs-guide/agram.sh b/LDP/guide/docbook/abs-guide/agram.sh
new file mode 100644
index 00000000..82ee3f96
--- /dev/null
+++ b/LDP/guide/docbook/abs-guide/agram.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+# agram.sh: Playing games with anagrams.
+
+# Find anagrams of...
+LETTERSET=etaoinshrdlu
+
+anagram "$LETTERSET" | # Find all anagrams of the letterset...
+grep '.......' |       # With at least 7 letters,
+grep '^is' |           # starting with 'is'
+grep -v 's$' |         # no plurals
+grep -v 'ed$'          # no past tense verbs
+
+#  Uses "anagram" utility
+#+ that is part of the author's "yawl" word list package.
+#  http://ibiblio.org/pub/Linux/libs/yawl-0.2.tar.gz
+
+exit 0                 # End of code.
+
+bash$ sh agram.sh
+islander
+isolate
+isolead
+isotheral
diff --git a/LDP/guide/docbook/abs-guide/cannon.sh b/LDP/guide/docbook/abs-guide/cannon.sh
new file mode 100644
index 00000000..40c06f0d
--- /dev/null
+++ b/LDP/guide/docbook/abs-guide/cannon.sh
@@ -0,0 +1,119 @@
+#!/bin/bash
+# cannon.sh: Approximating PI by firing cannonballs.
+
+# This is a very simple instance of a "Monte Carlo" simulation,
+#+ a mathematical model of a real-life event,
+#+ using pseudorandom numbers to emulate random chance.
+
+#  Consider a perfectly square plot of land, 10000 units on a side.
+#  This land has a perfectly circular lake in its center,
+#+ with a diameter of 10000 units.
+#  The plot is actually all water, except for the four corners.
+#  (Think of it as a square with an inscribed circle.)
+#
+#  Let us fire solid iron cannonballs from an old-style cannon
+#+ at the square of land.
+#  All the shots impact somewhere on the plot of land,
+#+ either in the lake or on the dry corners.
+#  Since the lake takes up most of the land area,
+#+ most of the shots will SPLASH! into the water.
+#  Just a few shots will THUD! into solid ground
+#+ in the far corners of the land.
+#
+#  If we take enough random, unaimed shots at the plot of land,
+#+ Then the ratio of SPLASHES to total shots will approximate
+#+ the value of PI/4
+#  Exercise: Explain why.
+#
+#  Theoretically, the more shots taken, the better the fit.
+#  However, a shell script, as opposed to a compiled language
+#+ with floating-point math built in, requires a few compromises.
+#  This tends to make the simulation less accurate, unfortunately.
+
+
+DIMENSION=10000  # Length of each side of the plot of land.
+                 # Also sets ceiling for random integers generated.
+
+MAXSHOTS=1000    # Fire this many shots.
+                 # 10000 or more would be better, but would take too long.
+PMULTIPLIER=4.0  # Scaling factor to approximate PI.
+
+get_random ()
+{
+SEED=$(head -1 /dev/urandom | od -N 1 | awk '{ print $2 }')
+RANDOM=$SEED                                  #  From "seeding-random.sh"
+                                              #+ example script.
+let "rnum = $RANDOM % $DIMENSION"             # Range less than 10000.
+echo $rnum
+}
+
+distance=        # Declare global variable.
+hypotenuse ()    # Calculate hypotenuse of a right triangle.
+{                # From "alt-bc.sh" example.
+distance=$(bc -l << EOF
+scale = 0
+sqrt ( $1 * $1 + $2 * $2 )
+EOF
+)
+#  Setting "scale" to zero rounds down result to integer value,
+#+ a necessary compromise in this script.
+#  This diminshes the accuracy of the simulation, unfortunately.
+}
+
+
+# main() {
+
+# Initialize variables.
+shots=0
+splashes=0
+thuds=0
+Pi=0
+
+while [ "$shots" -lt  "$MAXSHOTS" ]           # Main loop.
+do
+
+  xCoord=$(get_random)                        # Get random X and Y coords.
+  yCoord=$(get_random)
+  hypotenuse $xCoord $yCoord                  #  Hypotenuse of right-triangle =
+                                              #+ distance.
+  ((shots++))
+
+  printf "#%4d   " $shots
+  printf "Xc = %4d  " $xCoord
+  printf "Yc = %4d  " $yCoord
+  printf "Distance = %5d  " $distance         #  Distance from center
+                                              #+ of lake.
+
+  if [ "$distance" -le "$DIMENSION" ]
+  then
+    echo -n "SPLASH!  "
+    ((splashes++))
+  else
+    echo -n "THUD!    "
+    ((thuds++))
+  fi
+
+  Pi=$(echo "scale=9; $PMULTIPLIER*$splashes/$shots" | bc)
+  # Multiply ratio by 4.0.
+  echo -n "PI ~ $Pi"
+  echo
+
+done
+
+echo
+echo "After $shots shots, PI looks like approximately $Pi."
+# Tends to run a bit high... 
+# Probably due to round-off error and imperfect randomness of $RANDOM.
+echo
+
+# }
+
+exit 0
+
+#  One might well wonder whether a shell script is appropriate for
+#+ an application as complex and computation-intensive as a simulation.
+#
+#  There are at least two justifications.
+#  1) As a proof of concept: to show it can be done.
+#  2) To prototype and test the algorithms before rewriting
+#+    it in a compiled high-level language.
diff --git a/LDP/guide/docbook/abs-guide/color-echo.sh b/LDP/guide/docbook/abs-guide/color-echo.sh
new file mode 100644
index 00000000..c7a3da4e
--- /dev/null
+++ b/LDP/guide/docbook/abs-guide/color-echo.sh
@@ -0,0 +1,63 @@
+#!/bin/bash
+# color-echo.sh: Echoing text messages in color.
+
+# Modify this script for your own purposes.
+# It's easier than hand-coding color.
+
+black='\E[30;47m'
+red='\E[31;47m'
+green='\E[32;47m'
+yellow='\E[33;47m'
+blue='\E[34;47m'
+magenta='\E[35;47m'
+cyan='\E[36;47m'
+white='\E[37;47m'
+
+
+alias Reset="tput sgr0"      #  Reset text attributes to normal
+                             #+ without clearing screen.
+
+
+cecho ()                     # Color-echo.
+                             # Argument $1 = message
+                             # Argument $1 = color
+{
+local default_msg="No message passed."
+                             # Doesn't really need to be a local variable.
+
+message=${1:-$default_msg}   # Defaults to default message.
+color=${2:-$black}           # Defaults to black, if not specified.
+
+  echo -e "$color"
+  echo "$message"
+  Reset                      # Reset to normal.
+
+  return
+}  
+
+
+# Now, let's try it out.
+# ----------------------------------------------------
+cecho "Feeling blue..." $blue
+cecho "Magenta looks more like purple." $magenta
+cecho "Green with envy." $green
+cecho "Seeing red?" $red
+cecho "Cyan, more familiarly known as aqua." $cyan
+cecho "No color passed (defaults to black)."
+       # Missing $color argument.
+cecho "\"Empty\" color passed (defaults to black)." ""
+       # Empty $color argument.
+cecho
+       # Missing $message and $color arguments.
+cecho "" ""
+       # Empty $message and $color arguments.
+# ----------------------------------------------------
+
+echo
+
+exit 0
+
+# Exercises:
+# ---------
+# 1) Add the "bold" attribute to the 'cecho ()' function.
+# 2) Add options for colored backgrounds.
diff --git a/LDP/guide/docbook/abs-guide/ex30a.sh b/LDP/guide/docbook/abs-guide/ex30a.sh
new file mode 100644
index 00000000..655e0327
--- /dev/null
+++ b/LDP/guide/docbook/abs-guide/ex30a.sh
@@ -0,0 +1,75 @@
+#!/bin/bash
+# ex30a.sh: "Colorized" version of ex30.sh.
+#            Crude address database
+
+
+clear                                   # Clear the screen.
+
+echo -n "          "
+echo -e '\E[37;44m'"\033[1mContact List\033[0m"
+                                        # White on blue background
+echo; echo
+echo -e "\033[1mChoose one of the following persons:\033[0m"
+                                        # Bold
+tput sgr0
+echo "(Enter only the first letter of name.)"
+echo
+echo -en '\E[47;34m'"\033[1mE\033[0m"   # Blue
+tput sgr0                               # Reset colors to "normal."
+echo "vans, Roland"                     # "[E]vans, Roland"
+echo -en '\E[47;35m'"\033[1mJ\033[0m"   # Magenta
+tput sgr0
+echo "ones, Mildred"
+echo -en '\E[47;32m'"\033[1mS\033[0m"   # Green
+tput sgr0
+echo "mith, Julie"
+echo -en '\E[47;31m'"\033[1mZ\033[0m"   # Red
+tput sgr0
+echo "ane, Morris"
+echo
+
+read person
+
+case "$person" in
+# Note variable is quoted.
+
+  "E" | "e" )
+  # Accept upper or lowercase input.
+  echo
+  echo "Roland Evans"
+  echo "4321 Floppy Dr."
+  echo "Hardscrabble, CO 80753"
+  echo "(303) 734-9874"
+  echo "(303) 734-9892 fax"
+  echo "revans@zzy.net"
+  echo "Business partner & old friend"
+  ;;
+
+  "J" | "j" )
+  echo
+  echo "Mildred Jones"
+  echo "249 E. 7th St., Apt. 19"
+  echo "New York, NY 10009"
+  echo "(212) 533-2814"
+  echo "(212) 533-9972 fax"
+  echo "milliej@loisaida.com"
+  echo "Girlfriend"
+  echo "Birthday: Feb. 11"
+  ;;
+
+# Add info for Smith & Zane later.
+
+          * )
+   # Default option.	  
+   # Empty input (hitting RETURN) fits here, too.
+   echo
+   echo "Not yet in database."
+  ;;
+
+esac
+
+tput sgr0                               # Reset colors to "normal."
+
+echo
+
+exit 0
diff --git a/LDP/guide/docbook/abs-guide/poem.sh b/LDP/guide/docbook/abs-guide/poem.sh
new file mode 100644
index 00000000..b2fdfd32
--- /dev/null
+++ b/LDP/guide/docbook/abs-guide/poem.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+# poem.sh
+
+# Lines of the poem (single stanza).
+Line[1]="I do not know which to prefer,"
+Line[2]="The beauty of inflections"
+Line[3]="Or the beauty of innuendoes,"
+Line[4]="The blackbird whistling"
+Line[5]="Or just after."
+
+# Attribution.
+Attrib[1]=" Wallace Stevens"
+Attrib[2]="\"Thirteen Ways of Looking at a Blackbird\""
+
+for index in 1 2 3 4 5    # Five lines.
+do
+  printf "     %s\n" "${Line[index]}"
+done
+
+for index in 1 2          # Two attribution lines.
+do
+  printf "          %s\n" "${Attrib[index]}"
+done
+
+exit 0
diff --git a/LDP/guide/docbook/abs-guide/self-source.sh b/LDP/guide/docbook/abs-guide/self-source.sh
new file mode 100644
index 00000000..105dda1f
--- /dev/null
+++ b/LDP/guide/docbook/abs-guide/self-source.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+# self-source.sh: a script sourcing itself "recursively."
+# From "Stupid Script Tricks," Volume II.
+
+MAXPASSCNT=100    # Maximum number of execution passes.
+
+echo -n  "$pass_count  "
+#  At first execution pass, this just echoes two blank spaces,
+#+ since $pass_count still uninitialized.
+
+let "pass_count += 1"
+#  Assumes the uninitialized variable $pass_count
+#+ can be incremented the first time around.
+#  This works with Bash and pdksh, but
+#+ it relies on non-portable (and possibly dangerous) behavior.
+#  Better would be to set $pass_count to 0 if non-initialized.
+
+while [ "$pass_count" -le $MAXPASSCNT ]
+do
+  . $0   # Script "sources" itself, rather than calling itself.
+         # ./$0 (which would be true recursion) doesn't work here.
+done  
+
+#  What occurs here is not actually recursion,
+#+ since the script effectively "expands" itself
+#+ (generates a new section of code)
+#+ with each pass throught the 'while' loop',
+#  with each 'source' in line 20.
+#
+#  Of course, the script interprets each newly 'sourced' "#!" line
+#+ as a comment, and not as the start of a new script.
+
+echo
+
+exit 0   # The net effect is counting from 1 to 100.
+         # Very impressive.
+
+# Exercise:
+# --------
+# Write a script that uses this trick to do something useful.
diff --git a/LDP/guide/docbook/abs-guide/soundex.sh b/LDP/guide/docbook/abs-guide/soundex.sh
new file mode 100644
index 00000000..43cdb138
--- /dev/null
+++ b/LDP/guide/docbook/abs-guide/soundex.sh
@@ -0,0 +1,157 @@
+#!/bin/bash
+# soundex.sh: Calculate "soundex" code for names
+
+# =======================================================
+#        Soundex script
+#              by
+#         Mendel Cooper
+#     thegrendel@theriver.com
+#       23 January, 2002
+#
+#   Placed in the Public Domain.
+#
+# A slightly different version of this script appeared in
+#+ Ed Schaefer's July, 2002 "Shell Corner" column
+#+ in "Unix Review" on-line,
+#+ http://www.unixreview.com/documents/uni1026336632258/
+# =======================================================
+
+
+ARGCOUNT=1                     # Need name as argument.
+E_WRONGARGS=70
+
+if [ $# -ne "$ARGCOUNT" ]
+then
+  echo "Usage: `basename $0` name"
+  exit $E_WRONGARGS
+fi  
+
+
+assign_value ()                #  Assigns numerical value
+{                              #+ to letters of name.
+
+  val1=bfpv                    # 'b,f,p,v' = 1
+  val2=cgjkqsxz                # 'c,g,j,k,q,s,x,z' = 2
+  val3=dt                      #  etc.
+  val4=l
+  val5=mn
+  val6=r
+
+# Exceptionally clever use of 'tr' follows.
+# Try to figure out what is going on here.
+
+value=$( echo "$1" \
+| tr -d wh \
+| tr $val1 1 | tr $val2 2 | tr $val3 3 \
+| tr $val4 4 | tr $val5 5 | tr $val6 6 \
+| tr -s 123456 \
+| tr -d aeiouy )
+
+# Assign letter values.
+# Remove duplicate numbers, except when separated by vowels.
+# Ignore vowels, except as separators, so delete them last.
+# Ignore 'w' and 'h', even as separators, so delete them first.
+#
+# The above command substitution lays more pipe than a plumber &lt;g&gt;.
+
+}  
+
+
+input_name="$1"
+echo
+echo "Name = $input_name"
+
+
+# Change all characters of name input to lowercase.
+# ------------------------------------------------
+name=$( echo $input_name | tr A-Z a-z )
+# ------------------------------------------------
+# Just in case argument to script is mixed case.
+
+
+# Prefix of soundex code: first letter of name.
+# --------------------------------------------
+
+
+char_pos=0                     # Initialize character position. 
+prefix0=${name:$char_pos:1}
+prefix=`echo $prefix0 | tr a-z A-Z`
+                               # Uppercase 1st letter of soundex.
+
+let "char_pos += 1"            # Bump character position to 2nd letter of name.
+name1=${name:$char_pos}
+
+
+# ++++++++++++++++++++++++++ Exception Patch +++++++++++++++++++++++++++++++++
+#  Now, we run both the input name and the name shifted one char to the right
+#+ through the value-assigning function.
+#  If we get the same value out, that means that the first two characters
+#+ of the name have the same value assigned, and that one should cancel.
+#  However, we also need to test whether the first letter of the name
+#+ is a vowel or 'w' or 'h', because otherwise this would bollix things up.
+
+char1=`echo $prefix | tr A-Z a-z`    # First letter of name, lowercased.
+
+assign_value $name
+s1=$value
+assign_value $name1
+s2=$value
+assign_value $char1
+s3=$value
+s3=9$s3                              #  If first letter of name is a vowel
+                                     #+ or 'w' or 'h',
+                                     #+ then its "value" will be null (unset).
+				     #+ Therefore, set it to 9, an otherwise
+				     #+ unused value, which can be tested for.
+
+
+if [[ "$s1" -ne "$s2" || "$s3" -eq 9 ]]
+then
+  suffix=$s2
+else  
+  suffix=${s2:$char_pos}
+fi  
+# ++++++++++++++++++++++ end Exception Patch +++++++++++++++++++++++++++++++++
+
+
+padding=000                    # Use at most 3 zeroes to pad.
+
+
+soun=$prefix$suffix$padding    # Pad with zeroes.
+
+MAXLEN=4                       # Truncate to maximum of 4 chars.
+soundex=${soun:0:$MAXLEN}
+
+echo "Soundex = $soundex"
+
+echo
+
+#  The soundex code is a method of indexing and classifying names
+#+ by grouping together the ones that sound alike.
+#  The soundex code for a given name is the first letter of the name,
+#+ followed by a calculated three-number code.
+#  Similar sounding names should have almost the same soundex codes.
+
+#   Examples:
+#   Smith and Smythe both have a "S-530" soundex.
+#   Harrison = H-625
+#   Hargison = H-622
+#   Harriman = H-655
+
+#  This works out fairly well in practice, but there are numerous anomalies.
+#
+#
+#  The U.S. Census and certain other governmental agencies use soundex,
+#  as do genealogical researchers.
+#
+#  For more information,
+#+ see the "National Archives and Records Administration home page",
+#+ http://www.nara.gov/genealogy/soundex/soundex.html
+
+
+
+# Exercise:
+# --------
+# Simplify the "Exception Patch" section of this script.
+
+exit 0
diff --git a/LDP/guide/docbook/abs-guide/tempfile-name.sh b/LDP/guide/docbook/abs-guide/tempfile-name.sh
new file mode 100644
index 00000000..6f898d34
--- /dev/null
+++ b/LDP/guide/docbook/abs-guide/tempfile-name.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+# tempfile-name.sh:  temp filename generator
+
+BASE_STR=`mcookie`   # 32-character magic cookie.
+POS=11               # Arbitrary position in magic cookie string.
+LEN=5                # Get $LEN consecutive characters.
+
+prefix=temp          #  This is, after all, a "temp" file.
+                     #  For more "uniqueness," generate the filename prefix
+                     #+ using the same method as the suffix, below.
+
+suffix=${BASE_STR:POS:LEN}
+                     # Extract a 5-character string, starting at position 11.
+
+temp_filename=$prefix.$suffix
+                     # Construct the filename.
+
+echo "Temp filename = "$temp_filename""
+
+# sh tempfile-name.sh
+# Temp filename = temp.e19ea
+
+exit 0
diff --git a/LDP/guide/docbook/abs-guide/unit-conversion.sh b/LDP/guide/docbook/abs-guide/unit-conversion.sh
new file mode 100644
index 00000000..f519353f
--- /dev/null
+++ b/LDP/guide/docbook/abs-guide/unit-conversion.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+# unit-conversion.sh
+
+
+convert_units ()  # Takes as arguments the units to convert.
+{
+  cf=$(units "$1" "$2" | sed --silent -e '1p' | awk '{print $2}')
+  # Strip off everything except the actual conversion factor.
+  echo "$cf"
+}  
+
+Unit1=miles
+Unit2=meters
+cfactor=`convert_units $Unit1 $Unit2`
+quantity=3.73
+
+result=$(echo $quantity*$cfactor | bc)
+
+echo "There are $result $Unit2 in $quantity $Unit1."
+
+#  What happens if you pass incompatible units,
+#+ such as "acres" and "miles" to the function?
+
+exit 0
diff --git a/LDP/guide/docbook/abs-guide/usage-message.sh b/LDP/guide/docbook/abs-guide/usage-message.sh
new file mode 100644
index 00000000..43280084
--- /dev/null
+++ b/LDP/guide/docbook/abs-guide/usage-message.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+# usage-message.sh
+
+: ${1?"Usage: $0 ARGUMENT"}
+#  Script exits here if command-line parameter absent,
+#+ with following error message.
+#    usage-message.sh: 1: Usage: usage-message.sh ARGUMENT
+
+echo "These two lines echo only if command-line parameter given."
+echo "command line parameter = \"$1\""
+
+exit 0  # Will exit here only if command-line parameter present.
+
+# Check the exit status, both with and without command-line parameter.
+# If command-line parameter present, then "$?" is 0.
+# If not, then "$?" is 1.