I'm hoping someone can help me on this. I have a data file that greatly simplified might look like this:
sec;src;dst;proto
421;10.10.10.1;10.10.10.2;tcp
426;10.10.10.3;10.10.10.4;udp
442;10.10.10.5;10.10.10.6;tcp
sec;src;fac;dst;proto
521;10.10.10.1;ab;10.10.10.2;tcp... (3 Replies)
I'm having problems since few days ago, and i'm not able to make it works with a simple awk+grep script (or other way to do this).
For example, i have a input file1.txt:
cat inputfile1.txt
218299910417
1172051195
1172070231
1172073514
1183135117
1183135118
1183135119
1281440202
... (3 Replies)
I want to print the 1st field in a comma seperated file to lower case and the rest the case they are.
I tried this
nawk -F"," '{print tolower($0)}' OFS="," file
this converts whole line in to lower case i just want the first column to be converted.
The below doesnt work because in... (11 Replies)
Hi everyone,
Ok here's the scenario.
I have a control file like this.
component1,file1,file2,file3,file4,file5
component2,file1,file2,file3,file4,file5I want to do a while loop here to read all files for each component.
file_count=2
while ]
do
file_name=`cat list.txt | grep... (2 Replies)
I was trying to simplify this from what I'm actually doing, but I started getting even more confused so I gave up. Here is the content of my input file:
Academic year,Term,Course name,Period,Last name,Nickname
2012-2013,First Semester,English 12,7th Period,Davis,Lucille
When I do this:
... (3 Replies)
I have a process that requires me to read data from huge log files and find the most recent entry on a per-user basis. The number of users may fluctuate wildly month to month, so I can't code for it with names or a set number of variables to capture the data, and the files are large so I don't... (7 Replies)
In the f1 file below I am trying to clean it up removing lines the have _tn_ in them. Next, removing the characters in $2 before the ninth /. Then I remove the ID_(digit- always 4). Finally, the charcters after and including the first _. It is curently doing most of it but the cut is removing $1... (5 Replies)
Discussion started by: cmccabe
5 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)