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Top Forums UNIX for Dummies Questions & Answers Help regarding effective usage of diff for comparing files Post 302523927 by sarbjit on Friday 20th of May 2011 09:49:06 AM
Old 05-20-2011
Error Help regarding effective usage of diff for comparing files

Help regarding effective usage of diff for comparing files

Hi All,

I have few doubts regarding best usage of diff command. I also have some questions with out put of diff command.


File1:
ABC
DEF

File2:
ABC
DEFAA

Code:
diff file1 file2
2c2 
<DEF
-----
>DEFAA

QUESTION:
What does this 2c2 signifies. I also see some times it as 2d5, i have googled regarding this but couldn't found any information regarding this. If some one can please tell me what it signifies, that will be of great help, preferably if some link to study this.

COMING TO MY MAIN PROBLEM:

Problem statement:

I want to dump non common lines when two files are diffed to new files. In case of above example two files should be generated
i.e. file1_new and file2_new that contains only "DEF" and "DEFAA" only (lines which are not common).

I also want to maintain the line number (original) of these files to be dumped in new files.


Thanks in advance,
Sarbjit

Last edited by sarbjit; 05-21-2011 at 03:18 AM.. Reason: code tags...
 

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bdiff(1)						      General Commands Manual							  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 purpose 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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