I'm new to unix scripting. How would I go about pulling the first 3 characters from a variable in ksh and storing in another variable? Thanks. (9 Replies)
Hey all,
I have been using Ksh and in that I am setting Environment variables.
To set Env. Variables I have created my own file "BuildScript.sh" in which i have written :
export CLASSPATH=/somedir/some other dir/file:.
export PATH=/some dir/file:.
But when i am calling this... (4 Replies)
hi all,
how do i subract variables in shell ?? am trying to space out the headers and the output generated by the shell so they all line up :
currently the output is like this :
servers : users
server1 : 10
latestServer : 50
so i thought... (3 Replies)
Sorry for such a dreadful title, but I'm not sure how to be more descriptive. I'm hoping some of the more gurutastic out there can take a look at a solution I came up with to a problem, and advice if there are better ways to have gone about it.
To make a long story short around 20K pieces of... (2 Replies)
I'm trying to understand if it's possible to create a set of variables that are numbered based on another variable (using eval) in a loop, and then call on it before the loop ends.
As an example I've written a script called question (The fist command is to show what is the contents of the... (2 Replies)
I'm trying to set a variable to the output of a command.
This is what the comand output to the display looks like:
/>hciconndump -v TOsiu
Dump of connection(s): TOsiu
----------------------------------------------------------------------
Process: A60Tsiu Connection: TOsiu... (2 Replies)
Hi,
I am trying to use a database to store configurations in an environment definition scripts to make the configurations easily modifiable. (long story short - it is an easier process to make changes in the db than trying to deploy a file). The values will be stored in the database in the... (1 Reply)
Cannot combine these two strings into one line, either as a 3rd variable or echo or printing ? Frustrating.
for i in `cat /scripts/pathList.dat`
do
OldRepo= grep Oldhostname ${i}/.svn/entries | tail -1
NewRepo= grep Oldhostname ${i}/.svn/entries | tail -1 | sed '/Oldhostname/... (41 Replies)
Hi Friends ,
I want to know how to format the output for the following:
i searched in the forum and couldnt get the exact requirement.
Thanks in advance . (2 Replies)
I'm reading a text file using a while loop but when I call a function from within this loop it exits that same iteration … even though there are many more lines in the file to be read.
I thought it was something to do with the IFS setting but it appears that a function call (when run... (3 Replies)
Discussion started by: user052009
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)