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Full Discussion: Processing diff output
Top Forums Shell Programming and Scripting Processing diff output Post 302767385 by durden_tyler on Wednesday 6th of February 2013 06:39:27 PM
Old 02-06-2013
Quote:
Originally Posted by stevensw
How to get diff to not print the chevrons and the dashes? In this case the differences are all single line differences.
...
It's difficult to figure out what *exactly* you want without a concrete example. Please do post if you have one.

Maybe the diff output for your files with single-line differences looks like this?

Code:
$
$ cat f74
this is line 1
this is line 2
this is line 3
this is line 4
this is line 5
$
$
$ cat f75
this is line 1
this is line 2
this is line 30
this is line 4
this is line 5
$
$
$ diff f74 f75
3c3
< this is line 3
---
> this is line 30
$
$

You could process them further like so -

Code:
$
$ # print lines with no chevrons and dashes
$
$ diff f74 f75 | grep "^[^-]" | sed 's/^[><]//'
3c3
 this is line 3
 this is line 30
$
$

"grep" removes the lines that start with a dash ("-").
And thereafter, sed removes the chevrons (if present) from the remaining lines.

Not sure what you meant by this:

Quote:
Originally Posted by stevensw
...Also the first few lines don't matter. How to get the output to always exclude the first few lines?...
In the example above, if we exclude the first few lines, there will be nothing to display. There are only 4 lines in the actual diff output.

tyler_durden
 

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LEARN ABOUT OPENDARWIN

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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