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Full Discussion: diff output is it correct??
Top Forums Shell Programming and Scripting diff output is it correct?? Post 302405163 by ahmad.zuhd on Thursday 18th of March 2010 05:12:30 AM
Old 03-18-2010
Question diff output is it correct??

I'm asking for explanation about the output of the diff format when i compare the two files f1 and f2:

Code:
root@host1 # cat f1
205226
205237
205250
205255
205262
205274
205307
205403
205464
205477
205500
205520
205626
205759
205766
205776
205861
root@host1 # cat f2
204929
205018
205039
205237
205250
205255
205262
205403
205464
205477
205500
205626
205759
205766
205776
205936
205970
205975
205979
205983
205984


when i made a diff command i got the following:

Code:
root@host1 # diff f1 f2
1c1,3
< 205226
---
> 204929
> 205018
> 205039
6,8c8
< 205274
< 205307
< 205403
---
> 205403
12d11
< 205520
17c16,21
< 205861
---
> 205936
> 205970
> 205975
> 205979
> 205983
> 205984



my question is:

why output indicate the following:

6,8c8
< 205274
< 205307
< 205403
---
> 205403

instead of issuing a delete 6,7d7
and then 8 and 8 in both sides will not be displayed because they are equal.


actually, i don't understand why the c flag is required since the d and a flags are available.
 

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CUT-DIFF(1)							  Cutter's manual						       CUT-DIFF(1)

NAME
cut-diff - show difference between 2 files with color SYNOPSIS
cut-diff [option ...] file1 file2 DESCRIPTION
cut-diff is a diff command that uses diff feature in Cutter. It shows difference with color. It's recommended that you use a normal diff(1) when you want to use with patch(1) or you don't need color. OPTIONS
--version cut-diff shows its own version and exits. -c [yes|true|no|false|auto], --color=[yes|true|no|false|auto] If 'yes' or 'true' is specified, cut-diff uses colorized output by escape sequence. If 'no' or 'false' is specified, cut-diff never use colorized output. If 'auto' or the option is omitted, cut-diff uses colorized output if available. The default is auto. -u, --unified cut-diff uses unified diff format. --context-lines=LINES Shows diff context around LINES. All lines are shown by default. When unified diff format is used, 3 lines are shown by default. --label=LABEL, -L=LABEL Uses LABEL as a header label. The first--label option value is used as file1's label and the second --label option value is used asfile2's label. Labels are the same as file names by default. EXIT STATUS
The exit status is 0 for success, non-0 otherwise. TODO: 0 for non-difference, 1 for difference and non-0 for errors. EXAMPLE
In the following example, cut-diff shows difference between file1 and file2: % cut-diff file1 file2 In the following example, cut-diff shows difference between file1 and file2 with unified diff format: % cut-diff -u file1 file2 SEE ALSO
diff(1) Cutter February 2011 CUT-DIFF(1)
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