I have a pipe delimited file. I need to check that the first and second fields are 5 characters long and if not i need to append 0 in front of them to make them 5 characters long. can some body let mwe know how i can find the length of the two fields and then make them 5 characters long if they... (6 Replies)
Hi,
I have two files A.txt and B.txt. And i have the following attributes in both the files.
<date and time> <a unique id>
For eg:
<2007 May 30 20:29:36:034 GMT> <ID1> in A.txt
<2007 May 30 20:42:36:038 GMT> <ID1> in B.txt
Now, i need to find the time difference... (0 Replies)
Hi,
I have a fixed length file where I need to verify the values of 3 different fields, where each field will have a different value.
How can I do that in a single step. (6 Replies)
I have a field MPN-BANK-NUMBERO:006,00:N in a file FILE1
How can i display the length of the Bank Number.Any idea ?
The output shud take the following format
FILE 1 6
Where 1 is the starting position and 6 is the Ending position. (9 Replies)
Hi,
I have two files
one with 12486 lines
second one with 13116
As per the comparsion between two files the count have 630 difference
I used diff command to find the difference between two files but it's not understandable
could any one suggest any command to get 630 records in a new... (4 Replies)
I have a sample txt file which has different variable lengths of 2,10,3,15.
What is the command that I need use in order to get the record count that has length '3'
Thanks (3 Replies)
Hi,
My date is coming as
STARTDATE=Sun Jul 15 00:34:23 2012
ENDDATE=Sun Jul 15 00:50:04 2012I want difference between these two dates,anyone's helps will be appriciated.
Thanks
Prasoon (3 Replies)
Hi,
I am trying to figure out how to get the length of the longest column in the entire file (because the length varies from one row to the other)
I was doing this at first to check how many fields I have for the first row:
awk '{print NF; exit}' file
Now, I can do this:
awk '{ if... (4 Replies)
Legends,
I have a requirement to run the script exactly after one hour of completion of dependent script.
Eg: Script B should run after one hour on the completion of Script A.
I got the time stamps using following variables. these scripts runs in autosys
> DATE=`date +%H:%M`
>... (4 Replies)
Discussion started by: sdosanjh
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)