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Top Forums UNIX for Dummies Questions & Answers Difference between two huge files Post 302234783 by pyaranoid on Wednesday 10th of September 2008 10:10:21 AM
Old 09-10-2008
Difference between two huge files

Hi,

As per my requirement, I need to take difference between two big files(around 6.5 GB) and get the difference to a output file without any line numbers or '<' or '>' in front of each new line.

As DIFF command wont work for big files, i tried to use BDIFF instead.

I am getting incorrect number of records.

I have done the following test:

I have got a dat file with a few million records in it and to generate a another file i have used sed '1,100d' oldfile > newfile

so i am using Bdiff oldfile newfile | sed -n '/^</p' > DIFF.DAT

The output(DIFF) should be having 100 records in it. But i am getting an output with several records in it.

Could anyone help me out from this situation?

Thanks

Sue
 

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DIFF(1) 						      General Commands Manual							   DIFF(1)

NAME
diff - print differences between two files SYNOPSIS
diff [-c | -e | -C n] [-br]file1 file2 OPTIONS
-C n Produce output that contains n lines of context -b Ignore white space when comparing -c Produce output that contains three lines of context -e Produce an ed-script to convert file1 into file2 -r Apply diff recursively to files and directories of EXAMPLES
diff file1 file2 # Print differences between 2 files diff -C 0 file1 file2 # Same as above diff -C 3 file1 file2 # Output three lines of context with every diff -c file1 file2 # Same diff /etc /dev # Compares recursively the directories /etc and /dev diff passwd /etc # Compares ./passwd to /etc/passwd DESCRIPTION
the same name, when file1 and file2 are both directories" difference encountered" Diff compares two files and generates a list of lines telling how the two files differ. Lines may not be longer than 128 characters. If the two arguments on the command line are both directories, diff recursively steps through all subdirectories comparing files of the same name. If a file name is found only in one directory, a diagnostic message is written to stdout. A file that is of either block special, character special or FIFO special type, cannot be compared to any other file. On the other hand, if there is one directory and one file given on the command line, diff tries to compare the file with the same name as file in the directory directory. SEE ALSO
cdiff(1), cmp(1), comm(1), patch(1). DIFF(1)
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