1 . Thanks everyone who read the post first.
2 . I have a log file which size is 143M , I can not use vi open it .I can not use xedit open it too.
How to view it ?
If I want to view 200-300 ,how can I implement it
3 . Thanks (3 Replies)
hi,
i have a very big file that holding data, how could i pick line by line from this file.
the following process can illustrate better:
file
-------------------
123444444 |
122314567 |-----------data
146689000 |
c=123444444 ---------- c is variable
process c ... (3 Replies)
Hi,
I am using Sun Solaris 5.9 OS. I have found a file called wtmpx having a size of 5.0 GB. I want to clear this file using :>/var/adm/wtmpx. My query is, would it cause any problem to the running live system.
Could anyone suggest the best method to clear the file without causing problem to... (6 Replies)
Hi
I have two files, one is 1.6 GB. I would like to add one extra column of information to the large file at a specific location (after its 2nd column).
For example:
File 1 has two columns more than 1000 rows like this
MM009987 1
File 2 looks like this
MM00098 MM00076 3 4 2 4 2... (1 Reply)
We got data that was supposed to be CSV, but was sent in a huge XML file.
I've downloaded xmlstarlet, but I'm darned if I can get it to operate the "sel" feature to look down a path and get any sort of value. I see pieces of what should be paths, but they seem to have extraneous characters, and... (7 Replies)
Hello,
I need to know all IP range (ip_prefix), associated with us-west-2 region only from this link - https://ip-ranges.amazonaws.com/ip-ranges.json (it can be opened in wordpad for better visibility)
Please suggest, how would I do it. If vi, awk or sed is needed, I have downloaded it on my... (7 Replies)
Discussion started by: solaris_1977
7 Replies
LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS --predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO bup-midx(1), bup-save(1)BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown-bup-margin(1)