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chapter14/chg_base.ksh

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+#!/bin/ksh
+#
+# SCRIPT: chg_base.ksh
+# AUTHOR: Randy Michael
+# DATE: 10/4/2007
+# REV: 1.1.A
+#
+# PURPOSE: This script converts numbers between base
+# 2 through base 36. The user is prompted for input.
+#
+# NOTE: Numbers are in the following format:
+#
+#     base#number
+#
+# EXAMPLE:  16#264bf
+#
+##########################################
+# DEFINE FILES AND VARIABLES HERE
+##########################################
+
+# Setup the correct awk usage. Solaris needs to
+# use nawk instead of awk.
+
+case $(uname) in
+SunOS) AWK="nawk"
+       ;;
+    *) AWK="awk"
+       ;;
+esac
+
+# 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 $SHELL in
+*/bin/bash) alias echo="echo -e"
+            ;;
+esac
+
+##########################################
+# BEGINNING OF MAIN
+##########################################
+
+# Prompt the user for an input number with base
+
+echo "\nInput the number to convert in the following format:
+
+Format: base#number
+
+Example: 16#264BF \n"
+
+read ibase_num
+
+# Extract the base from the ibase_num variable
+
+ibase=$(echo $ibase_num | $AWK -F '#' '{print $1}')
+
+# Test to ensure the input base is an integer
+
+case $ibase in
+  [0-9]*) : # do nothing
+          ;;
+       *) echo "\nERROR: $ibase is not a valid number for input base\n"
+          exit 1
+          ;;
+esac
+
+# Test to ensure the input base is between 2 and 36
+
+if (( ibase < 2 || ibase > 36 ))
+then
+    echo "\nERROR: Input base must be between 2 and 36\n"
+    exit 1
+fi
+
+# Ask the user for the output base
+
+echo "\nWhat base do you want to convert $ibase_num to?
+NOTE: base 2 through 36 are valid\n"
+echo "Output base: \c"
+read obase
+
+# Test to ensure the output base is an integer
+
+case $obase in
+  [0-9]*) : # do nothing
+          ;;
+       *) echo "\nERROR: $obase is not a valid number\n"
+          exit 1
+          ;;
+esac
+
+# Test to ensure the output base is between 2 and 36
+
+if (( obase < 2 || obase > 36 ))
+then
+    echo "\nERROR: Output base must be between 2 and 36\n"
+    exit 1
+fi
+
+# Save the input number before changing the base
+
+in_base_num=$ibase_num
+
+# Convert the input number to the desire output base
+
+typeset -i$obase ibase_num
+
+# Assign the output base number to an appropriate variable name
+
+obase_num=$ibase_num
+
+# Display the result
+
+echo "\nInput number $in_base_num is equivalent to $obase_num\n"
+