bdiff - diff for large files
bdiff file1 file2 [n] [-s]
bdiff compares two files and produces output identical to what would
be produced by diff (see diff(1)), specifying changes that must be
made to make the files identical. bdiff is designed for handling
files that are too large for diff, but it can be used on files of any
bdiff processes files as follows:
+ Ignore lines common to the beginning of both files.
+ Split the remainder of each file into n-line segments, then
execute diff on corresponding segments. The default value of
n is 3500.
bdiff recognizes the following command-line arguments:
file2 Names of two files to be compared by bdiff. If file1
or file2 (but not both) is -, standard input is used
n If a numeric value is present as the third argument,
the files are divided into n-line segments before
processing by diff. Default value for n is 3500.
This option is useful when 3500-line segments are too
large for processing by diff.
-s Silent option suppresses diagnostic printing by
bdiff, but does not suppress possible error messages
from diff). If the n and -s arguments are both used,
the n argument must precede the -s option on the
command line or it will not be properly recognized.
LC_MESSAGES determines the language in which messages are displayed.
If LC_MESSAGES is not specified in the environment or is set to the
empty string, the value of LANG is used as a default for each
unspecified or empty variable. If LANG is not specified or is set to
the empty string, a default of "C" (see lang(5)) is used instead of
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000
If any internationalization variable contains an invalid setting,
bdiff behaves as if all internationalization variables are set to "C".
International Code Set Support
Single- and multi-byte character code sets are supported.
both files standard input (bd2)
Standard input was specified for both files. Only one file
can be specified as standard input.
non-numeric limit (bd4)
A non-numeric value was specified for the n (third)
Find differences between two large files: file1 and file2, and place
the result in a new file named diffs_1.2.
bdiff file1 file2 >>>>diffs_1.2
Do the same, but limit file length to 1400 lines; suppress error
bdiff file1 file2 1400 -s >>>>diffs_1.2
bdiff produces output identical to output from diff, and makes the
necessary line-number corrections so that the output looks like it was
processed by diff. However, depending on where the files are split,
bdiff may or may not find a fully minimized set of file differences.
Hewlett-Packard Company - 2 - HP-UX Release 11i: November 2000