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======
alfsum
======

-----------------------
calculate ALF checksums
-----------------------

:Manual section: 1
:Manual group: Urchlay's Atari 8-bit Tools
:Date: |date|
:Version: |version|

SYNOPSIS
========

alfsum **file** [**file** ...] | [**--help** | **-h**] | [**--version** | **-V**] 

DESCRIPTION
===========

**alfsum** calculates the checksums used by the **ALF** compression
utility on the Atari 8-bit platform.

To read from standard input, use **-** as a filename.

Output lines have a tab separating the checksum and filename, for ease
of scripting (e.g. with **cut**\(1) or **awk**\(1)).

**alfsum**'s primary use is to check files extracted from **ALF**
archives against the checksums stored in the archive. The **unalf**
program already does this, but **alfsum** is a separate (much simpler)
program. It serves as a second opinion, in case you suspect a bug in
**unalf**.

OPTIONS
=======

-h, --help
   Show built-in help message.

-V, --version
  Show **alfsum** version number and exit.

NOTES
=====

The checksum algorithm is very simple: all the bytes in the file are
added together, and the low 16 bits of the result are the checksum.

EXIT STATUS
===========

0
  Success.

1 to 254
  File I/O error count. If there are more than 254 I/O errors, 254 is returned.

255
  Error in command-line arguments: no filenames given.

COPYRIGHT
=========

**alfsum** is released under the WTPFL: Do WTF you want with this.

AUTHORS
=======

B. Watson <urchlay@slackware.uk>

SEE ALSO
========

**unalf**\(1)

.. include:: manftr.rst