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1. Shell Programming and Scripting
Hey guys, my first post on UNIX Forums(much overdue IMO)!
I've got this bit of code that doesn't seem to be working correctly for an Android app I'm working on:
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2. Shell Programming and Scripting
Greetings!
Here's what I believe is a "simple one" for the community tonight ;)
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3. Programming
Hallo everybody,
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4. Shell Programming and Scripting
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5. UNIX for Advanced & Expert Users
Hello,
I need to create an snmp.comf file that defines 2 IPs to the same community string.
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6. Programming
Hello, the following is generating a error at the line "tmprintf(&tmBundle, _TMC("{0}"),Prompt);"... a bit lost as I am diving into this debug...
Thank you in advance...
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{
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7. Shell Programming and Scripting
Hi
I use awk command to delete the first blanc line of a file:
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8. UNIX for Dummies Questions & Answers
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9. UNIX for Dummies Questions & Answers
Hi,
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10. Shell Programming and Scripting
Hi there could someone explain what is happening in the following function/statement for me, im just a little confused
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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)