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chapter14/equate_base_8_to_10.ksh

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+#!/usr/bin/ksh
+#
+# SCRIPT: equate_base_8_to_10.ksh
+# AUTHOR: Randy Michael
+# DATE: 07/07/2007
+# REV: 1.2.P
+#
+# PURPOSE: This script is used to convert a base 8 number
+#          to a base 10 decimal representation.
+#          This scripts expects that a base 8 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`
+typeset -i BASE_8_NUM
+typeset -i BASE_10_NUM
+
+#################################################
+# DEFINE FUNCTIONS HERE
+#################################################
+
+function usage
+{
+echo "\nUSAGE: $SCRIPT_NAME base_8_number"
+echo "\nEXAMPLE: $SCRIPT_NAME 2774"
+echo "\nWill return the decimal base 10 number 1532 ...EXITING...\n"
+}
+
+#################################################
+# BEGINNING OF MAIN
+#################################################
+
+# Check for a single command line argument
+
+if [ $# -ne 1 ]
+then
+        echo "\nERROR: A base 8 number must be supplied..."
+        usage
+        exit 1
+fi
+
+# Check that this single command line argument is a octal number!
+
+case $1 in
++([-0-8])) BASE_8_NUM=$1
+           ;;
+        *) echo "\nERROR: $1 is NOT a base 7 number"
+           usage
+           exit 1
+          ;;
+esac
+
+BASE_10_NUM=$((8#${BASE_8_NUM}))
+
+echo $BASE_10_NUM