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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CMP(1) BSD General Commands Manual CMP(1)
NAME
cmp -- compare two files
SYNOPSIS
cmp [-l | -s] file1 file2 [skip1 [skip2]]
DESCRIPTION
The cmp utility compares two files of any type and writes the results to the standard output. By default, cmp is silent if the files are the
same; if they differ, the byte and line number at which the first difference occurred is reported.
Bytes and lines are numbered beginning with one.
The following options are available:
-l Print the byte number (decimal) and the differing byte values (octal) for each difference.
-s Print nothing for differing files; return exit status only.
The optional arguments skip1 and skip2 are the byte offsets from the beginning of file1 and file2, respectively, where the comparison will
begin. The offset is decimal by default, but may be expressed as an hexadecimal or octal value by preceding it with a leading ``0x'' or
``0''.
The cmp utility exits with one of the following values:
0 The files are identical.
1 The files are different; this includes the case where one file is identical to the first part of the other. In the latter case, if the
-s option has not been specified, cmp writes to standard output that EOF was reached in the shorter file (before any differences were
found).
>1 An error occurred.
SEE ALSO
diff(1), diff3(1)
STANDARDS
The cmp utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.
BSD
June 6, 1993 BSD