Listing 3: amp.sh

#!/bin/ksh
#######################################################
#
# amp.sh - configurable menu script
#
#######################################################
trap "" 1 2 3

#VARIABLES
AMPNAME="${1}"        # User name indentifier
AMPDIR=/usr/bin/amp   # Directory for Config file
AMPCFG=ampusers       # Configuration file
AMPTITLE="\n\n\tAMP - Administration Menu Program\n"
AMPLEVEL=${AMPLEVEL:-0}
let "AMPLEVEL = AMPLEVEL + 1"
DT="`date +'%D - %T'`"
export AMPNAME DT AMPLEVEL

# Get user menu info from config file
USRINFO=`awk 'BEGIN {FS = "\n"; RS = ""}
{ if ( $1 == NAME )
{ print $0 }
}' NAME=$AMPNAME   ${AMPDIR}/${AMPCFG}`

# Determine total number of menu options
TOTLOPTS=`echo "$USRINFO" | awk 'BEGIN {FS = "\n"
RS = ""} { print NF }'`

# Load MENUPGM and MENUTEXT arrays
CNT=2
MENU_NUMBR=1
while [ $MENU_NUMBR -lt $TOTLOPTS ]
do
# MENUINFO - configuration file menu line
MENUINFO=`echo "$USRINFO" | awk 'BEGIN {FS = "\n"
RS = ""} {print $FLD}' FLD=$CNT`

# MENUTEXT - menu option text string
MENUTEXT[${MENU_NUMBR}]=`echo "$MENUINFO" | awk -F"~" '{print $1}'`

# MENUPGM - program/script to execute   #           for menu option
MENUPGM[${MENU_NUMBR}]=`echo "$MENUINFO" | awk -F"~" '{print $2}'`
let "CNT = CNT + 1"
let "MENU_NUMBR = MENU_NUMBR + 1"
done

# Set up Menu Prompts depending on
#   number of menu options
if [ $TOTLOPTS -gt 9 ]
then
PROMPT="\n\tPlease enter option number (\"n\" for next page): \c"
else
PROMPT="\n\tPlease enter option number: \c"
fi

# Set up exit method depending on level of
#   menu structure
if [ $AMPLEVEL -eq 1 ]
then
EXITLINE="\tx) Exit\n"
EXITCMD="trap 1 2 3; exit 0"
else
EXITLINE="\tx) Exit Sub-Menu\n"
EXITCMD="exit 0"
fi

# Set up Menu Page depending on number
#   of total menu options
MENUPAGE=0
let "TEMPVAR = TOTLOPTS - MENUPAGE"
if [ $TEMPVAR -lt 10 ]
then
MENUOPTIONS="$TEMPVAR"
else
MENUOPTIONS=10
fi

#
# Loop and present the menu options
#  until user chooses the exit menu option
#
while [ true ]
do
clear
echo $AMPTITLE
echo $EXITLINE
MENU_NUMBR=1
# Start Menu Options number at 0 if  MENUPAGE > 10
[ $MENUPAGE -ge 10 ] && MENU_NUMBR=0
let "PGM_NUMBR = MENU_NUMBR + MENUPAGE"
# print menu options
while [ $MENU_NUMBR -lt $MENUOPTIONS ]
do
echo  "\t${MENU_NUMBR}) ${MENUTEXT[${PGM_NUMBR}]}"

let "MENU_NUMBR = MENU_NUMBR + 1"
let "PGM_NUMBR = PGM_NUMBR + 1"
done
echo $PROMPT
read ANSWER

# Process menu choice response
case $ANSWER in
x|X|e|E|q|Q) eval $EXITCMD
;;
# Execute menu choice after
#   adding menu page offset
[0-9]) let "PGM_NUMBR = ANSWER + MENUPAGE"
eval ${MENUPGM[${PGM_NUMBR}]}
;;
# Go to next menu page
n|N) let "MENUPAGE = MENUPAGE + 10"
# Set MENUPAGE back to 0
#   if greater than last option
[ $MENUPAGE -gt $TOTLOPTS ] && MENUPAGE=0
let "TEMPVAR = TOTLOPTS - MENUPAGE"
if [ $TEMPVAR -lt 10 ]
then
MENUOPTIONS=$TEMPVAR
else
MENUOPTIONS=10
fi
;;
*) ;;
esac
done
trap 1 2 3
exit 0

# End of File