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chapter14/equate_base_2_to_16.ksh

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+#!/usr/bin/ksh
+#
+# SCRIPT: equate_base_2_to_16.ksh
+# AUTHOR: Randy Michael
+# DATE: 07/07/2007
+# REV: 1.2.P
+#
+# PURPOSE: This script is used to convert a base 2 number 
+#          to a base 16 hexadecimal representation.
+#          This scripts expects that a base 2 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 $SHELL in
+*/bin/bash) alias echo="echo -e"
+            ;;
+esac
+
+#################################################
+# DEFINE FUNCTIONS HERE
+#################################################
+
+function usage
+{
+echo "\nUSAGE: $SCRIPT_NAME {base 2 number}"
+echo "\nEXAMPLE: $SCRIPT_NAME 1100101101"
+echo "\nWill return the hexadecimal base 16 number 32d"
+echo "\n\t ...EXITING...\n"
+}
+
+#################################################
+# BEGINNING OF MAIN
+#################################################
+
+# Check for a single command line argument
+
+if (($# != 1))
+then
+        echo "\nERROR: A base 2 number must be supplied..."
+        usage
+        exit 1
+fi
+
+# Check that this single command line argument is a binary number!
+
+case $1 in
++([-0-1])) BASE_2_NUM=$1
+           ;;
+        *) echo "\nERROR: $1 is NOT a base 2 number"
+           usage
+           exit 1
+          ;;
+esac
+
+# Assign the base 2 number to the BASE_16_NUM variable
+
+BASE_16_NUM=$((2#${BASE_2_NUM}))
+
+# Now typeset the BASE_16_NUM variable to base 16.
+# This step converts the base 2 number to a base 16 number.
+
+typeset -i16 BASE_16_NUM
+
+# Display the resulting base 16 representation
+
+echo $BASE_16_NUM
+