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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 REDHAT

diffstat

DIFFSTAT(1)						      General Commands Manual						       DIFFSTAT(1)

NAME

       diffstat - make histogram from diff-output

USAGE

       diffstat [options] [file-specifications]

SYNOPSIS

       This program reads the output of diff and displays a histogram of the insertions, deletions, and modifications per-file.

DESCRIPTION

       Diffstat  is a program that is useful for reviewing large, complex patch files.	It reads from one or more input files which contain output
       from diff, producing a histogram of the total lines changed for each file referenced.  If the input filename ends with  .bz2,  .Z  or  .gz,
       diffstat will read the uncompressed data via a pipe.

       Diffstat recognizes the most popular types of output from diff:

	      unified
		     preferred by the patch utility.

	      context
		     best for readability, but not very compact.

	      default
		     not good for much, but simple to generate.

       Diffstat  detects  the lines that are output by diff to tell which files are compared, and then counts the markers in the first column that
       denote the type of change (insertion, deletion or modification).  These are shown in the histogram as "+", "-" and "!" characters.

       If no filename is given on the command line, diffstat reads the differences from the standard input.

OPTIONS

       -c     prefix each line of output with "#", making it a comment-line for shell scripts.

       -f format
	      specify 0 for concise, 1 for normal output.

       -k     suppress the merging of filenames in the report.

       -n number
	      specify the minimum width used for filenames.  If you don't specify this, diffstat uses the length of the  longest  filename,  after
	      stripping common prefixes.

       -p number
	      override the logic that strips common pathnames, simulating the patch "-p" option.

       -u     suppress the sorting of filenames in the report.

       -V     prints the current version number

       -w number
	      specify  the  maximum  width  of	the histogram.	The plot will never be shorter than 10 columns, just in case the filenames get too
	      large.

ENVIRONMENT

       Diffstat runs in a portable UNIX(R) environment.

FILES

       Diffstat is a single binary module, which uses no auxiliary files.

BUGS

       Diffstat makes a lot of assumptions about the format of a diff file.

       There's no easy way to determine the degree of overlap between the "before" and "after" displays of modified lines.

SEE ALSO

       diff (1).

AUTHOR

       Thomas Dickey <dickey@invisible-island.net>.

																       DIFFSTAT(1)
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