I want to collect the characters from 1-10 and 20-30 from each line of the file and take them in a file in the following format.Can someone help me with this :
string1,string2
string1,string2
string1,string2
:
:
:
: (7 Replies)
Hi All,
I have searched the forum but couldn't find exactly what I need. Hopefully someone may be able to help.
I'm trying to put a script together that will extract numbers from a text file and multiply them by, for example 1.5 or 1.2
Sample file looks like this...... (1 Reply)
Hello Everyone,
i have quick question.
I have file names like: bin_map300.asc and I would like to extract grid300.
My approach so far:
name=bin_map300.asc
echo ${name%%.*}
echo ${name##*_}
I am stuck combining the two.
Any help would be appreciated. (3 Replies)
Hi all,
I'm a new programmer to shell script... and I have no idea how to use substring.
I want to extract the numbers from the following string and place it into a variable:
"170 unique conformations found"
The numbers can be more than three digits depending on the case. I just want to... (10 Replies)
Hi,
I've looked at a few existing posts on this, but they don't seem to work for my inputs.
I have a text file where I want to extract all the text between two strings, every time that occurs.
Eg my input file is
Anna said that she would fetch the bucket.
Anna and Ben moved the bucket.... (9 Replies)
I'm new to all this and I've been fiddling with this problem for HOURS and feel silly that I can't work it out!
I have a .log file that VERY long and looks like this:
2011-08-31 10:03:34 SUESTART AG Amndmnt Client WebRequest DNU SUEEND Sequence: 600,
2011-08-31 10:03:34 SUESTART... (11 Replies)
Hi All,
I have a file whose common patter is like this:
.I 1
.U
87049087
.S
Some text here too
.M
This is a text
.T
Some another text here
.P
Name of the book
.W
Some lines of more text. This text needs to be extracted.
.A
more text goes here too
.I 2 (2 Replies)
Hi I am part of a academic organization and I want to send a fax to the students however there must be a quicker way to get the fax numbers extracted from the online forms they sent me.
The file looks like this (numbers are fake in order to protect identity):
Biochemistry Major
Michael... (3 Replies)
I have number 192.168.21.8.
I want to extract from this number with sed 21 and 8 to variables a and b. Any Ideas?
I did like 's/\(192.168.\)/ /' but its wrong :( (6 Replies)
Discussion started by: Natalie
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)