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.TH "ALFSUM" 1 "2025-11-18" "0.1.0" "Urchlay's Atari 8-bit Tools"
.SH NAME
alfsum \- calculate ALF checksums
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.SH SYNOPSIS
.sp
alfsum \fBfile\fP [\fBfile\fP ...] | [\fB\-\-help\fP | \fB\-h\fP] | [\fB\-\-version\fP | \fB\-V\fP]
.SH DESCRIPTION
.sp
\fBalfsum\fP calculates the checksums used by the \fBALF\fP compression
utility on the Atari 8\-bit platform.
.sp
To read from standard input, use \fB\-\fP as a filename
.sp
Output lines have a tab separating the checksum and filename, for ease
of scripting (e.g. with \fBcut\fP(1) or \fBawk\fP(1)).
.SH OPTIONS
.INDENT 0.0
.TP
.B  \-h\fP,\fB  \-\-help
Show built\-in help message.
.TP
.B  \-V\fP,\fB  \-\-version
Show \fBalfsum\fP version number and exit.
.UNINDENT
.SH NOTES
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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.
.SH EXIT STATUS
.INDENT 0.0
.TP
.B 0
Success.
.TP
.B 1 to 254
File I/O error count. If there are more than 254 I/O errors, 254 is returned.
.TP
.B 255
Error in command\-line arguments: no filenames given.
.UNINDENT
.SH COPYRIGHT
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\fBunalf\fP is released under the WTPFL: Do WTF you want with this.
.SH AUTHORS
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.IP B. 3
Watson <\fI\%urchlay@slackware.uk\fP>
.UNINDENT
.SH SEE ALSO
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\fBunalf\fP(1)
.sp
The git repository for \fBunalf\fP:
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.INDENT 3.5
\fI\%https://slackware.uk/~urchlay/repos/unalf\fP
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Other Atari\-related projects by the author, including \fBbw\-atari8\-tools\fP
and \fBunmac65\fP:
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.INDENT 3.5
\fI\%https://slackware.uk/~urchlay/repos/\fP
.UNINDENT
.UNINDENT
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