02-18-2010
Huge File Comparison
Hi i need to compare two fixed length files and produce the differences if any to a seperate file. I have to capture each and every differneces line by line. Ideally my files should not have any differences but if there are any then it should be captured without any miss. Also my files sizes are very huge say more than 2 GB.
Please help me with a code in either awk or shell script which does this huge file comparison with increase in some performance.
Regards,
Naveen
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I have a file {filename} which contains 65000 records
I need to split into 6 smaller files roughly 11000 records each.
Can someone advise me of the Unix command to do so ?
Many thanks (2 Replies)
Discussion started by: grinder182533
2 Replies
2. Solaris
Hi,
I have files with records of 40,00,000& 39,00,000 and i want to find out the
content
1.which is existing in file1 and not in file2.
2.Which is exisitng in file2 and not in file1.
The format of the file will be like
404ABCDEFGHIJK|CDEFGHIJK|1234567890|1
If its a smaller one i... (1 Reply)
Discussion started by: salaathi
1 Replies
3. Shell Programming and Scripting
Hi All
I am sorting a huge file
-rw-r--r-- 1 rama users 448156978 May 13 18:48 102384.temp
$ sort -k 1,40n 102384.temp > 102384.temp1
msgcnt 1468 vxfs: mesg 001: vx_nospace - /dev/vg00/var file system full (1 block extent)
sort: A write error occurred while sorting.
I thought... (3 Replies)
Discussion started by: dhanamurthy
3 Replies
4. Shell Programming and Scripting
I have a file with data extracted, and need to insert a header with a constant string, say: H|PayerDataExtract
if i use sed, i have to redirect the output to a seperate file like
sed ' sed commands' ExtractDataFile.dat > ExtractDataFileWithHeader.dat
the same is true for awk
and... (10 Replies)
Discussion started by: deepaktanna
10 Replies
5. Shell Programming and Scripting
Hi ,
i have files coming in my system which are very huge in MB and GBs, all these files are in a single line, there is no newline character.
I need to get only last 700 bytes of these files, of this i am splitting the files by "split -b 700 filename" but this gives all the splitted... (2 Replies)
Discussion started by: Prateek007
2 Replies
6. Shell Programming and Scripting
I got three different file:
Part of File 1
ARTPHDFGAA
.
.
Part of File 2
ARTGHHYESA
.
.
Part of File 3
ARTPOLYWEA
.
. (4 Replies)
Discussion started by: patrick87
4 Replies
7. Shell Programming and Scripting
Hi Experts,
I had to edit (a particular value) in header line of a very huge file so for that i wanted to search & replace a particular value on a file which was of 24 GB in Size. I managed to do it but it took long time to complete. Can anyone please tell me how can we do it in a optimised... (7 Replies)
Discussion started by: manishkomar007
7 Replies
8. UNIX for Dummies Questions & Answers
Hi all,
I hope you are well. I am very happy to see your contribution. I am eager to become part of it.
I have the following question. I have two huge files to compare (almost 3GB each). The files are simulation outputs. The format of the files are as below
For clear picture, please see... (9 Replies)
Discussion started by: kaaliakahn
9 Replies
9. UNIX for Dummies Questions & Answers
Please help. My file system is 100%, I can't seem to find what is taking so much space. The total hard drive space is 150Gig free but I got nothing now.
I did to this to find the big file but it's taking so much time. Is there any other way?
du -ah / | more
find ./ -size +200M... (3 Replies)
Discussion started by: samnyc
3 Replies
10. Solaris
Gents
I have huge NAS File System as /sys with size 10 TB and I want to Split each 1TB in spirit File System to be mounted in the server.
How to can I do that without changing anything in the source.
Please your support. (1 Reply)
Discussion started by: AbuAliiiiiiiiii
1 Replies
CMP(1) BSD General Commands Manual CMP(1)
NAME
cmp -- compare two files
SYNOPSIS
cmp [-l | -s | -x] [-hz] 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:
-h Do not follow symbolic links.
-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.
-x Like -l but prints in hexadecimal and using zero as index for the first byte in the files.
-z For regular files compare file sizes first, and fail the comparison if they are not equal.
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 a hexadecimal or octal value by preceding it with a leading ``0x'' or
``0''.
EXIT STATUS
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 error 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. The -h, -x, and -z options are extensions to the standard.
HISTORY
A cmp command appeared in Version 1 AT&T UNIX.
BSD
November 18, 2013 BSD