178 lines
4.3 KiB
Bash
Executable File
178 lines
4.3 KiB
Bash
Executable File
#!/usr/bin/ksh
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#
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# SCRIPT: equate_any_base.ksh
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# AUTHOR: Randy Michael
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# DATE: 07/07/2007
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# REV: 1.2.P
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#
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# PURPOSE: This script is used to convert a number to any
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# supported number base, which is at least base 36.
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# This script requires that two command line
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# auguments and the "number" to be converted
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# are present on the command line. An example
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# number base conversion is shown here:
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#
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# equate_any_base.ksh -f16 -t2 e245c
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# 2#11100010010001011100
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#
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# This example converts the base 16 number, e245c, to
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# the base 2 equivalent, 2#11100010010001011100.
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# The 2#, which precedes the binary number, shows
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# the base of the number represented.
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#
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# EXIT CODES:
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# 0 - Normal script execution
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# 1 - Usage error
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#
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# set -x # Uncomment to debug this shell script
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# set -n # Uncomment to check syntax without any execution
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#
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######################################################
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# DEFINE FILES AND VARIABLES HERE
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######################################################
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SCRIPT_NAME=$(basename $0)
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COUNT=0
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MAX_COUNT=$#
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# Setup the correct echo command usage. Many Linux
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# distributions will execute in BASH even if the
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# script specifies Korn shell. BASH shell requires
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# we use echo -e when we use \n, \c, etc.
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case $SHELL in
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*/bin/bash) alias echo="echo -e"
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;;
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esac
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######################################################
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# DEFINE FUNCTIONS HERE
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######################################################
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function usage
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{
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echo "\nUSAGE: $SCRIPT_NAME -f{starting base} -t{ending base} NUMBER"
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echo "\nEXAMPLE: $SCRIPT_NAME -f16 -t10 FC23"
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echo "\nWill return the decimal base 10 number 64547"
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echo "\t ...EXITING...\n"
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}
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######################################################
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# CHECK COMMAND LINE AUGUMENTS HERE
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######################################################
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# The maximum number of command line arguments is five
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# and the minimum number is three.
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if (($# > 5))
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then
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echo "\nERROR: Too many command line arguments\n"
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usage
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exit 1
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elif (($# < 3))
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then
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echo "\nERROR: Too few command-line arguments\n"
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usage
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exit 1
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fi
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# Check to see if the command-line switches are present
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echo $* | grep -q '\-f' || (usage; exit 1)
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echo $* | grep -q '\-t' || (usage; exit 1)
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# Use getopts to parse the command line arguments
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while getopts ":f:t:" ARGUMENT
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do
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case $ARGUMENT in
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f) START_BASE="$OPTARG"
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;;
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t) END_BASE="$OPTARG"
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;;
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\?) usage
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exit 1
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;;
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esac
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done
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# Ensure that the START_BASE and END_BASE variables
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# are not NULL.
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if [ -z "$START_BASE" ] || [ "$START_BASE" = '' ] \
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|| [ -z "$END_BASE" ] || [ "$END_BASE" = '' ]
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then
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echo "\nERROR: Base number conversion fields are empty\n"
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usage
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exit 1
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fi
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# Ensure that the START_BASE and END_BASE variables
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# have integer values for the number base conversion.
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case $START_BASE in
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+([0-9])) : # Do nothing - Colon is a no-op.
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;;
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*) echo "\nERROR: $START_BASE is not an integer value"
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usage
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exit 1
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;;
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esac
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case $END_BASE in
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+([0-9])) : # Do nothing - Colon is a no-op.
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;;
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*) echo "\nERROR: $END_BASE is not an integer value"
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usage
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exit 1
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;;
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esac
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######################################################
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# BEGINNING OF MAIN
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######################################################
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# Begin by finding the BASE_NUM to be converted.
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# Count from 1 to the max number of command line auguments
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while ((COUNT < MAX_COUNT))
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do
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((COUNT == COUNT + 1))
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TOKEN=$1
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case $TOKEN in
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-f) shift; shift
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((COUNT == COUNT + 1))
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;;
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-f${START_BASE}) shift
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;;
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-t) shift; shift
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((COUNT == COUNT + 1))
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;;
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-t${END_BASE}) shift
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;;
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*) BASE_NUM=$TOKEN
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break
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;;
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esac
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done
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# Typeset the RESULT variable to the target number base
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typeset -i$END_BASE RESULT
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# Assign the BASE_NUM variable to the RESULT variable
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# and add the starting number base with a pound sign (#)
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# as a prefix for the conversion to take place.
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# NOTE: If an invalid number is entered a system error
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# will be displayed. An example is inputting 1114400 as
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# a binary number, which is invalid for a binary number.
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RESULT="${START_BASE}#${BASE_NUM}"
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# Display the result to the user or calling program.
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echo "$RESULT"
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# End of script...
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