im having trouble doing this:
i have a variable with 2 characters repeating e.g. aababbbaaaababaabbaabbba
is there a way i can search the variable for a's and b's and then change a's to b's and b's to a's?
im guessing its like getting the 1's compliment of the string
im doing this in... (2 Replies)
Greetings,
I am doing something that I don't know if it is possible...
I have a file with a line looks like this:
<%s \n%s / %s \n%s \n>
and I am trying to replace this line with
<%s \n%s \n%s / %s \n%s \n>
in Shell script with sed command...
StringToReplace='%s \n%s / %s \n%s \n'... (2 Replies)
I need to do the following:
text in the format of: ADDRESS=abcd123:1111
- abcd123:1111 is different on every system.
replace with: ADDRESS=localhost:2222
sed 's/ADDRESS=<What do I use here?>/ADDRESS=localhost:2222/g'
Everything I've tried ends up with:
... (3 Replies)
How can I replace the follong text including to number 7000?
cat tmp0.txt
Winston (UK) Wong
I would the 7000 to replace Winston (UK) Wong.
I fail with method below:
sed ' s /Winston\(UK\)Wong/7000 tmp0.txt' (1 Reply)
Hi All,
I have a text file that contains
I1SP2 *=*=Y=M=D001D
My requirement is to replace all occurrence of =* to =Z
expected o/p is I1SP2 *=Z=Y=M=D001D
I have tried with
sed 's/=*/=Z/g' file
sed 's!\=*!\=Z/g' file
sed 's!\=*!\=Z!g' file
sed 's!\=\*!\=Z!g' file
but its not... (3 Replies)
Hi all
I got test.test.test and need
test.test\.test *
I need the backslash before the last dot in the line
I tried
echo test.test.test | sed 's/\./\\./g'
but it gives me
test\.test\.test
Thanks (7 Replies)
Hi Gurus,
I have a requirement which needs to pass a parameter when calling the script, using this parameter to find a file name stored in master file. then read the file content. the issue is in the file name has a special character "$". don't know how to handle this. below is example:
the... (10 Replies)
hi all,
i'd like to modify a file with sed , i want to substuite a char "-" with "/"
how can i do this?
Thanks for all
regards
Francesco (16 Replies)
Discussion started by: Francesco_IT
16 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)