Diff Checker is an online diff tool to compare text differences between two text files. Enter the contents of two files and click Find Difference.
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Active5 years, 8 months ago
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I'm getting a
diff: memory exhausted
error when trying to diff two 27 GB files that are largely similar on a Linux box with CentOS 5 and 4 GB of RAM. This is a known problem, it seems.I would expect there to be an alternative for such an essential utility, but I can't find one. I imagine the solution would have to use temporary files rather than memory to store the information it needs.
- I tried to use
rdiff
andxdelta
, but they are better for showing the changes between two files, like a patch, and are not that useful for inspecting the differences between two files. - Tried VBinDiff, but it is a visual tool which is better for comparing binary files. I need something that can pipe the differences to STDOUT like regular
diff
. - There are a lot of other utilities such as
vimdiff
that only work with smaller files. - I've also read about Solaris
bdiff
but I could not find a port for Linux.
Any ideas besides splitting the file into smaller pieces? I have 40 of these files so trying to avoid the work of breaking them up.
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Tom BTom B
3 Answers
cmp
does things byte-by-byte, so it probably won't run out of memory (just tested it on two 7 GB files) -- but you might be looking for more detail than a list of 'files X and Y differ at byte x, line y'. If the similarities of your files are offset (e.g., file Y has an identical block of text, but not at the same location), you can pass offsets to cmp
; you could probably turn it into a resynchronizing compare with a small script.Aside: In case anyone else lands here when looking for a way to confirm that two directory structures (containing very large files) are identical:
Scottdiff --recursive --brief
(or diff -r -q
for short, or maybe even diff -rq
) will work and not run out of memory.17.2k1111 gold badges4646 silver badges9292 bronze badges
FelixFelix
I found this link
Format Usb For Large Files Mac
diff -H might help, or you can try installing the textproc/2bsd-diff port which apparently doesn't try to load the files into RAM, so it can work on large files more easily.
![Format usb for large files mac Format usb for large files mac](/uploads/1/2/6/8/126879412/931909207.png)
I'm not sure if you tried those two options or if they might work for you. Good luck.
JarvinJarvin![Diff Diff](https://www.git-tower.com/blog/content/posts/90-diff-tools-windows/kdiff3.png)
Format Flash Drive For Large Files Mac
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If the files are identical (same length) except for a few byte values, you can use a script like following (
w
is the number of bytes per line to hexdump, adjust to your display width):It's not very fast, but does the job.
How To Send Large Files
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File compare software are those software that make the developers able to make the comparison and compare the multiple files to find out the duplicate one. The term data comparison itself stand for calculation and display of the differences and similarities between data objects. These make the developers and programmers able to compared objects like text files and source code to ensure there is no duplication at all. The overall process and the result obtained from that process in known as diff because of UNIX diff utility. The differences then present by most of the file comparing tools in form of graphical user interface or as part of larger tasks in file systems, networks or revision control. There are many text editors and word processors that are capable in performing file compare functions but at basic levels. In order to get the full highlight of the possible differences or similarities, the developers and programmers are advised to go for advanced file compare software. The software listed below are capable in performing the functions of file comparison between multiple files. These enables the user to compare files and folders quickly and merge the changes, synchronize their files and generates reports for their own records. These will allow the users to compare even entire drives in addition to folder and files at high speed and heck just size and modified times or verify each file with the byte-by-byte comparison.