Program: IFCRC.EXE / Author: David Bennett / Date: 3-17-88 / Version: 1.0

Description:

  Compiled using Borland's Turbo Pascal 4.0 compiler.

  This program is for use in a batch file.  It allows you to execute commands
  based on whether or not a certain file matches the given CRC value.  The
  program can also be used to check the CRC value of a file.

  Although I primarily wrote this program to execute a certain command based
  on whether a file has been altered or not, It could also be used to check
  a daily transfer from a remote site or even used to check for computer
  viruses.

  I herby release this program to the public domain (Guilt FreeWare!)

Usage:

  IFCRC <Filename> {NOT} {Dec/$Hex CRC} {DOS Command} {Dos Command...}

  * If only <Filename> is supplied then the CRC for that filename will be
    displayed on the CRT.

  * If the NOT operator is specified then the DOS command will be executed if
    the CRC of <Filename> does not match that of the CRC on the command line.

  * The CRC will default to a decimal number.  If a '$' preceedes the number
    it will be interpreted as a hexidecimal number.

Examples:

  IFCRC IFCRC.EXE

     This command will return the CRC value of the file IFCRC.EXE in
     Hexdecimal and Decimal notation.

  IFCRC WHATSUP.DOC $CD34 TYPE WHATSUP.DOC | MORE

     If the CRC of the file WHATSUP.DOC is $CD34 (Hexidecmal) then the file
     will be displayed on the screen one page at a time.

  IFCRC HODEE.DOE NOT 12345 ECHO An error has occured!

     If the CRC of the file HODEE.DOE does not equal 12345 (Decimal) then an
     error message will be displayed to the screen.  This command will also
     execute is the file HODEE.DOE does not exist!

About CRC (Cyclic Redundancy Check):

  CRC stands for Cyclic Redundancy Check.  It is based on the CCITT standard
  algorythm: X^16 + X^12 + X^5 + 1.  CRC is used primarily to check file
  transfers to make sure they where made sucessfully.  Some error checking
  protocols (I.E.  Xmodem CRC) do this automattically with each block of data
  transfered.

  The CRC of any block of text is a number 16-bit binary number.  This makes
  it very unlikely (1 chance in 65536) that two different files have the same
  CRC value.  Therefore to guard against one of your systems crucial files
  being altered, you can use IFCRC to control processing based on the
  integrity of any file.

Error Messages:

  Message:                            Description:
  --------------------------          ------------------------------------
  Bad character in CRC value          The given CRC is not a valid number.
				      Check to make sure the proper command
				      line syntax was used.

  DOS command expected                IFCRC.EXE could not find a DOS command
				      supplied on the command line. Check
				      syntax.


  File <filename> not found!          The supplied filename could not be
				      opened. This error will only be
				      displayed when using IFCRC to display
				      the CRC of a given file.

The Author:

  David Bennett
  Bennett Software Solutions
  151 West Geospace Drive
  Indepedence, MO  64056.

  CompuServe ID: 74635,1671