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Full Discussion: Comparing two one-line files and selecting what does not match
Top Forums Shell Programming and Scripting Comparing two one-line files and selecting what does not match Post 303021745 by wbport on Wednesday 15th of August 2018 06:35:49 PM
Old 08-15-2018
diff reports differences between two files and what has to happen to change the first file into the second. If a record appears in the first file but not the second, diff reports the line(s) on the first file a d and the line where they used to be on the 2nd file

A record on the 2nd file but not the first, a a reports the line number of the first file and the records added.

File 1 contains (actually 1 per line) 1 3 5 9 10 11 12 23 48 and
File 2 contains (actually 1 per line) 2 4 6 8 9 yy 10, the output from diff will be
Code:
1,3c1,4
< 1
< 3
< 5
---
> 2
> 4
> 6
> 8
4a6
> yy
6,9d7
< 11
< 12
< 23
< 48

Only lines starting with ">" or "<" appear in one file but not the other. You should never have a change where you have both symbols and a "---" line.
 

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LEARN ABOUT MOJAVE

bdiff

bdiff(1)                                                           User Commands                                                          bdiff(1)

NAME

       bdiff - big diff

SYNOPSIS

       bdiff filename1 filename2 [n] [-s]

DESCRIPTION

       bdiff  is  used in a manner analogous to diff to find which lines in filename1 and filename2 must be changed to bring the files into agree-
       ment. Its purpose is to allow processing of files too large for diff. If filename1 (filename2) is -, the standard input is read.

       bdiff ignores lines common to the beginning of both files, splits the remainder of each file into n-line segments, and invokes diff on cor-
       responding segments. If both optional arguments are specified, they must appear in the order indicated above.

       The  output  of  bdiff  is exactly that of diff, 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, bdiff does not necessarily find  a  smallest
       sufficient set of file differences.

OPTIONS

       n        The  number  of line segments. The value of n is 3500 by default. If the optional third argument is given and it is numeric, it is
                used as the value for n. This is useful in those cases in which 3500-line segments are too large for diff, causing it to fail.

       -s       Specifies that no diagnostics are to be printed by bdiff (silent option). Note:  However, this does not suppress possible diagnos-
                tic messages from diff, which bdiff calls.

USAGE

       See largefile(5) for the description of the behavior of bdiff when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

FILES

       /tmp/bd?????

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWesu                      |
       +-----------------------------+-----------------------------+
       |CSI                          |enabled                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       diff(1), attributes(5), largefile(5)

DIAGNOSTICS

       Use help for explanations.

SunOS 5.10                                                          14 Sep 1992                                                           bdiff(1)
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