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chapter14/equate_base_10_to_8.ksh

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+#!/usr/bin/ksh
+#
+# SCRIPT: equate_base_10_to_8.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 8 octal representation.
+#          This scripts 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`
+typeset -i8 BASE_8_NUM
+typeset -i BASE_10_NUM
+
+# 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_10_number"
+echo "\nEXAMPLE: $SCRIPT_NAME 946"
+echo "\nWill return the octal base 8 number 1662 ...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
+
+BASE_10_NUM="$1"
+
+BASE_8_NUM=$((10#${BASE_10_NUM}))
+echo $BASE_8_NUM | grep "#" >/dev/null 2>&1
+if [ $? -eq 0 ]
+then
+        echo $BASE_8_NUM | cut -f2 -d "#"
+else
+        echo $BASE_8_NUM
+fi