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chapter14/equate_base_10_to_16.ksh

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+#!/usr/bin/ksh
+#
+# SCRIPT: equate_base_10_to_16.ksh
+# AUTHOR: Randy Michael
+# DATE: 07/07/2007
+# REV: 1.2.P
+#
+# PURPOSE: This script is used to convert a base 10 number
+# to a base 16 hexadecimal representation.
+# This script expects that a base 10 number
+# is supplied as a single argument.
+#
+# EXIT CODES:
+#               0 - Normal script execution
+#               1 - Usage error
+#
+#
+# REV LIST:
+#
+#
+# set -x # Uncomment to debug this script
+# set -n # Uncomment to check command syntax without any execution
+#
+#
+#################################################
+# DEFINE FILES AND VARIABLES HERE
+#################################################
+
+SCRIPT_NAME=`basename $0`
+
+# Set up the correct echo command usage. Many Linux
+# distributions will execute in Bash even if the
+# script specifies Korn shell. Bash shell requires
+# we use echo -e when we use \n, \c, etc.
+
+case $(basename $SHELL) in
+bash) alias echo="echo -e"
+      ;;
+esac
+
+#################################################
+# DEFINE FUNCTIONS HERE
+#################################################
+function usage
+{
+echo "\nUSAGE: $SCRIPT_NAME {base 10 number}"
+echo "\nEXAMPLE: $SCRIPT_NAME 694"
+echo "\nWill return the hexadecimal number 2b6"
+echo "\n\t...EXITING...\n"
+}
+
+#################################################
+# BEGINNING OF MAIN
+#################################################
+
+# Check for a single command-line argument
+
+if [ $# -ne 1 ]
+then
+        echo "\nERROR: A base 10 number must be supplied..."
+        usage
+        exit 1
+fi
+
+# Check that this single command-line argument is a base 10 number!
+case $1 in
++([0-9])) BASE_10_NUM=$1
+          ;;
+*) echo "\nERROR: $1 is NOT a base 10 number"
+   usage
+   exit 1
+   ;;
+esac
+
+# Assign the base 10 number to the BASE_16_NUM variable
+
+BASE_16_NUM=10#$BASE_10_NUM
+
+# NOTE: Since base 10 is implied by default,
+# the 10# may be omitted as a prefix. Both notations
+# are supported
+
+# Now typeset the BASE_16_NUM variable to base 16.
+# This step converts the base 10 number to a base 16 number.
+
+typeset -i16 BASE_16_NUM
+
+# Display the resulting base 16 number representation
+
+echo $BASE_16_NUM
+
+# This following code is optional. It removes the number base
+# prefix. This may be helpful if using this script with
+# other programs and scripts.
+#
+# Set up the correct awk usage. Solaris needs to
+# use nawk instead of awk.
+#
+# case $(uname) in
+# SunOS) AWK="nawk"
+#        ;;
+#     *) AWK="awk"
+#        ;;
+# esac
+#
+# Strip out the base prefix and the pound sign (#). (Optional)
+#
+# echo $BASE_16_NUM | grep -q "#"
+#
+# if (($? == 0))
+# then
+#     echo $BASE_16_NUM | $AWK -F '#' '{print $2}'
+# else
+#     echo $BASE_16_NUM
+# fi