Hello Awk Gurus,
Can anyone of you help me with the below problem. I have got a file having data in below format
pmFaultyTransportBlocks
-----------------------
9842993
pmFrmNoOfDiscRachFrames
-----------------------
NULL
pmNoRecRandomAccSuccess
-----------------------... (4 Replies)
I have a log file that for some reason, once or two time a month, line foods are missing.
This log is generated from vmstat everyminute. I dont know why sometimes it does this.
Each line in the log should have 18 columns separated by one or more spaces.
Good Log: (not actual log)
1 1... (8 Replies)
Hello,
I'm rather new to the world of regular expressions and sed, though am excited by its possibilities. I have a particular task I'd like to achieve, and have googled the topic quite a bit. However, having found some codes that perform a task very similar to what I'd like to do, I can't for... (2 Replies)
Hi guys
task removing the last commas of 5th and 6th columns. The bug in the script is causing effect because of whitespaces around commas. I tried to delete white spaces first and running the above script. but still some where getting the results wrong.
I already have a script to do this... (12 Replies)
1. The problem statement, all variables and given/known data:
Problem Statement for project:
When an account is created on the CS Unix network, a
public html directory is created in the account's home directory. A default web page is put into that directory.
Some users replace or... (13 Replies)
Hi all
I use aix (sadly).
I've got a file consisting of fields separated by commas, I need a sed or awk command that will delete all spaces between two commas as long as there are only spaces between the commas.
eg
,abc, ,sd , ,dr at
would become
,abc,,sd ,,dr at
I have... (53 Replies)
Hello all, I need some help with sed. seems like i cant get through it. So here is what i am trying. when i do ps -ef|grep bla blah ...like below...i get /u01/app/oracle/11g/bin/tnslsnr .... but i want to replace that string with something using sed. So basically i want to get rid of... (3 Replies)
With sed
1. I need to find a line that contains "DVM" and "73069".
2. I need to insert a double quote at the beginning of the first line of the file.
These two have been driving me crazy for the last 45 minutes. Any help would be greatly appreciated.
Thanks (3 Replies)
Regularly we have questions like: i have an XML (C, C++, ...) file with this or that property and i want to extract the content of this or that tag (function, ...). How do i do it in sed?
Yes, in some (very limited) cases this is possible, but in general this can't be done. That is: you can do... (0 Replies)
All,
I'm getting a list like the following and I'd like to kill each PID in turn.
pid (17797)
pid (21748)
pid (21754)
pid (21704)
pid (2199)
pid (2159)
pid (17809)
pid (21769)
pid (21778)
pid (21715)
... (3 Replies)
Discussion started by: ejianu
3 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)