It worked with below script.
but I have a concern. I dont think this will work if data inside the quotes changed
and word count increased in some rows. What if my data goes like this
I've seen several examples of scripts in thise forum about having a script generate a log file. I have a script that is run from cron and that monitors a file system for a specfic filename(s) and then performs some actions on them. Normally I call this script from another script (which the one... (2 Replies)
Hi,
I am new to the shell programming.,
My requirement is , I have an shell file, which call internally the sql file, which generates 4 files on the directory., and then shell has to create the file which contains all the ftp commands to extract the files to different server for later... (1 Reply)
Hi Friends
I have an requirement that i need to generate html file using script.
and the script output shold keep adding to that html file like tablewise.
can anyone please help me out in this.
thanks
Krish. (2 Replies)
Dear Members,
I have a table in Oracle DB and one of its column name is INFO which has data in text format which we need to fetch in a script and create an xml file of a new table from the input.
The contents of a single cell of INFO column is like:
Area:app - aam
Clean Up Criteria:... (0 Replies)
Hello;
I need to generate a csv file that contains a list of all the files in a particular server (from the root directory ie: \) that have a permission stamp of 777. I would like to create the csv so that it contains the following:
server name, file name, full path name where file exists,... (17 Replies)
hi all i want a script to FTP a file and should generate a quality checksum file
means when I FTP a file from one server to another server it should generate a QC file which should contain timestamp,no.of records in that file
Thanks in advance
saikumar (3 Replies)
Dears,
I am new in shell world and I need your help in this, I have to create a report based on the output file generated by another program. I want to write a shell script for this.
The output file generated every 15 minutes but i can’t open it until the end of day so the script will get the... (3 Replies)
Dears,I need your help in this, I have to create a report based on the output file generated by another program. I want to write a shell script for this. The output file generated every 15 minutes but i can’t open it until the end of day so the script will get the file as an input the file will be... (8 Replies)
Discussion started by: abdul2020
8 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)