Hi, I have a file that looks like this
dasdjasdjoasjdoasjdoa SYN dakspodkapsdka
asdasdasdasdasdasdasd SYN sdfsdfsdfsdfdf
shfishifhsdifhsidhfif fsdfsdfsdfsdfs
sdfsdfsdfsdsdfsdfsdff cercercercerce
sdasdajsdoajsodasodoo FIN dasdaskdpasdda... (4 Replies)
Hi,
Is there any way of using grep (this may be done in awk, not sure?) that I can stop grep'n a file once I have found the first occurrence of my search string. Looking through grep man pages
-q will exit without printing the lines after the first match, but I need the output.
I have... (5 Replies)
Hi All,
is there a way to extract the line number of an occurrence using grep?
I know that with the -n option it prints out the line number as well.
I would like to assign the line number to a variable.
Thanks,
Sarah (5 Replies)
Hi,
Is there a command to print one character x amont of times?
I need for example 10 comma's (,,,,,,,,,,). Instead of creating a loop, I was wondering if there is a way to do this with sed or awk?
Thanks! (3 Replies)
I have 1300 files (SearchFiles0001.txt, SearchFiles0002.txt, etc.) , each with 650,000 lines, tab-delimited data.
I have a pattern file, with about 1000 lines with a single word. Each single word is found in the 1300 files once.
If I grep -f PatternFile.txt SearchFiles*.txt >OutputFile.txt... (2 Replies)
I have a file similar to the following
filler filler filler
car 6 mazda
filler filler filler filler
car civic honda
car rav 4 toyota
filler filler
If i do a "grep -i car file.txt" the output would be
car 6 mazda
car civic honda
car rav 4 toyota
however, i want to have the... (4 Replies)
Hi,
I want to add a text to the end of the specific line in a file. Now my file looks like this:
999
111
222
333
111
444
I want to add the string " 555" to the end of the first line contaning 111. Moreover, I want to insert a newline after this line containg the "000" string. The... (8 Replies)
Hi,
I have been trying to do a small fun project for myself.
I want to run a command for 45 seconds.
And to get the final output of this command, the script requires I push the "q" key on my keyboard and then the final output file becomes available.
I tried the following script. But it... (12 Replies)
I have file contents
/tmp/x/abc.txt
/home/bin/backup/sys/a.log
I need this output:
/tmp/x/
/home/bin/backup/sys/
Can somebody please help me out
Please use CODE tags as required by forum rules! (3 Replies)
Discussion started by: jhonnyrip
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)