'\" te
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.TH BDIFF 1 "Sep 14, 1992"
.SH NAME
bdiff \- big diff
.SH SYNOPSIS
.LP
.nf
\fBbdiff\fR \fIfilename1\fR \fIfilename2\fR [\fIn\fR] [\fB-s\fR]
.fi

.SH DESCRIPTION
.sp
.LP
\fBbdiff\fR is used in a manner analogous to \fBdiff\fR to find which lines in
\fIfilename1\fR and \fIfilename2\fR must be changed to bring the files into
agreement. Its purpose is to allow processing of files too large for
\fBdiff\fR. If \fIfilename1 (filename2)\fR is \fB\(mi\fR, the standard input is
read.
.sp
.LP
\fBbdiff\fR ignores lines common to the beginning of both files, splits the
remainder of each file into \fIn\fR-line segments, and invokes \fBdiff\fR on
corresponding segments. If both optional arguments are specified, they must
appear in the order indicated above.
.sp
.LP
The output of \fBbdiff\fR is exactly that of \fBdiff\fR, with line numbers
adjusted to account for the segmenting of the files (that is, to make it look
as if the files had been processed whole). Note:  Because of the segmenting of
the files, \fBbdiff\fR does not necessarily find a smallest sufficient set of
file differences.
.SH OPTIONS
.sp
.ne 2
.na
\fB\fIn\fR \fR
.ad
.RS 7n
The number of line segments. The value of \fIn\fR is 3500 by default. If the
optional third argument is given and it is numeric, it is used as the value for
\fIn\fR. This is useful in those cases in which 3500-line segments are too
large for \fBdiff\fR, causing it to fail.
.RE

.sp
.ne 2
.na
\fB\fB-s\fR \fR
.ad
.RS 7n
Specifies that no diagnostics are to be printed by \fBbdiff\fR (silent option).
Note:  However, this does not suppress possible diagnostic messages from
\fBdiff\fR, which \fBbdiff\fR calls.
.RE

.SH USAGE
.sp
.LP
See \fBlargefile\fR(7) for the description of the behavior of \fBbdiff\fR when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
.SH FILES
.sp
.LP
\fB/tmp/bd\fI?????\fR\fR
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
CSI	enabled
.TE

.SH SEE ALSO
.sp
.LP
.BR diff (1),
.BR attributes (7),
.BR largefile (7)
.SH DIAGNOSTICS
.sp
.LP
Use \fBhelp\fR for explanations.