Hi ,
Can you guys please help as I have list of files xaa, xab, xac.........xza for eg in which to perform load the 1st (xaa) and insert into table, then only proceed for the 2nd , 3rd and so forth.
In other words, before 1st one finished, 2nd one shall not load and insert to table, and so... (0 Replies)
Hello, I know how to join multiple files using the cat function. I want to do something a little more advanced. Basically I want to put the filename in the first column...
One thing to note is that the file is tab delimited.
e.g.
file1.txt
joe 1 4 5 6 7 3
manny 2 3 4 5 6 7
... (4 Replies)
Hi all,
I have 20 files (file001.txt upto file020.txt) and I want to read them from 3rd line upto end of file (line 1002). But in the final file they should appear to start from line 1.
I need following kind of output in a single file:
Filename Line number 2ndcolumn 4thcolumn
I... (14 Replies)
HI All,
I want to know if it is possible to print the same message but into 2 different files in the same command?
Something like
.
..
...
echo "Text" >> file1 && file2
this is because i creating a script which i use a log but i don't want to duplicate lines of command just to... (5 Replies)
Hi Forum.
I'm struggling to find a solution for the following issue.
I have multiple files a1.txt, a2.txt, a3.txt, etc. and I would like to insert a tab-delimited header record at the beginning of each of the files.
This is my code so far but it's not working as expected.
for i in... (2 Replies)
Hi,
I have a lot of files similar to the below order. I want to rename all the files .discrading the time stamp/numbers after cnf.
Existing files
id_info_20130405.cnf_20130801
in_info_20130405.cnf_20130891
iz_info_20130405.cnf_20130821
in_info_20130405.cnf_20130818... (2 Replies)
Hi,
I have a list of filenames in the format with Spaces in the filename.
As an example :
Sample File 1.txt
Sample File 2.txt
Sample File 3.txt.....I have about 100 files like this.
I am trying to create a block of code or use an available command to a) Create a file b) Put in some... (2 Replies)
Please help, I want to join multiple files based on column 1, and put the missing values as 0. Also the colname in the output should say which file the values came from.
FILE1
1 11
2 12
3 13
FILE2
2 22
3 23
4 24
FILE3
1 31
3 33
4 34
FILE1 FILE2 FILE3
1 11 0 31 (1 Reply)
hi there
I have a lot of files with same number of rows and columns.$2 and $3 are the same in all files .
I run awk script and merge $2,$3,$1 from first file and $1 from another files.
I would like to know how to modify awk script to insert filename as header for merged columns ( Expected... (6 Replies)
Discussion started by: ali.seifaddini
6 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)
04-04-2013
