bdiff man page on DigitalUNIX

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bdiff(1)							      bdiff(1)

NAME
       bdiff - Finds differences in large files

SYNOPSIS
       bdiff file1 file2 [number] [-s]

       bdiff - file2 [number] [-s]

       bdiff file1 - [number] [-s]

       The bdiff command compares file1 and file2 and writes information about
       their differing lines to standard output.   If  either  filename	 is  -
       (dash), bdiff reads standard input.

OPTIONS
       Suppresses  error  messages.   (May either precede or follow the number
       argument if it is specified.)

DESCRIPTION
       The bdiff command uses diff to find lines that must be changed  in  two
       files  to make them identical (see the diff command).  Its primary pur‐
       pose is to permit processing of files that are too large for diff.

       The bdiff command ignores lines common to the beginning of both	files,
       splits  the  remainders into sections of number lines, and runs diff on
       the sections.  The output is then processed to make it look as if  diff
       had processed the files whole.

       If you do not specify number, a system default is used.	In some cases,
       the number you specify or the default number may be too large for diff.
       If bdiff fails, specify a smaller value for number and try again.

       Note  that  because of file segmenting, bdiff does not necessarily find
       the smallest possible set of file differences.	In  general,  although
       the output is similar, using bdiff is not the equivalent of using diff.

NOTES
       The  diff command is executed by a child process, generated by forking,
       and communicates with bdiff through pipes.

       It should not normally be necessary to use this command, since diff can
       handle most large files.

EXIT STATUS
       No differences.	Differences found.  An error occurred.

SEE ALSO
       Commands:  diff(1), diff3(1)

								      bdiff(1)
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