actually, it seems somewhat confusing.. let me clearify it
i want a file having all the attributes produced by ls -lc command. i want to add one more thing i.e. time of last access to a file attribute. so how can i merge these two things in a single file in a columnar way.
i tried with these... (2 Replies)
Hello
Please help me to write Shell script.
I want to merge 2 data files . The data files have common columns
The data file A have 3 columns
Host Version Numberof Failuers
The data file B have also 3 coulmns
Host Version NumberofFailuers .
I want to merge A and B file... (2 Replies)
Hi All,
I want to merge two lines in a file till the end of the file. So what could be the command to get so.
say file name : sample.txt
contents:
country=1
send apps =1 rece=2
country=2
send apps =3 rece=3
..
...
output:
country=1;send apps =1 rece=2
country=2;send apps =3... (6 Replies)
Hi,
I want to merge the lines starting with a comma symbol with the previous line of the file.
Input :
cat file.txt
name1,name2
,name3,name4
emp1,emp2,emp3
,emp4
,emp5
user1,user2
,user3
Output
name1,name2,name3,name4
emp1,emp2,emp3,emp4,emp5 (9 Replies)
Hi All:
I have following files:
File 1:
<header>
text...
text ..
text ..
text ..
<\header>
x
y
z
...
File 2:
<header>
text...
text ..
text .. (4 Replies)
hello,
I have a file which has the following structure:
word <TAB> frequency
The same word can have multiple frequencies:
John <TAB> 60
John <TAB> 20
John <TAB> 30
Mary <TAB> 1000
Mary <TAB> 800
Mary <TAB> 20
What I need is a script which could merge all these frequencies into one single... (10 Replies)
Hello,
Firstly I just wanted to say that I'm not a programmer at all and appreciate any help you can give. I am trying to create a shellscript that reformats the file and adding up colums 5 and 6 for those sections that are continuation of the previous line(s) (signified by beginning with '*')... (4 Replies)
Dear All, I have two file like this:
file1:
a1234
b1235
c4678
d7859
file2 :
e4575
f7869
g7689
h9687
I want output like this:
a1234
b1235
c4678 (2 Replies)
Hi I need to merge 4 files. The issue i am facing is all the files have headers and i do not want them in the final output file. Can anybody suggest how to do it? (5 Replies)
Hello,
I have a file with few lines starting with a digit (1-5 only ) followed by a dot (.). Remaining all the lines to be merged with its previous numbered lines. Merging must be done with a space.
E.g.,
Source file:
3. abc def
xyz
5. pqr mno
def
4. jkl uvw
7. ghi
1. abc xyz
6. mno... (4 Replies)
Discussion started by: magnus29
4 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)