Hi all,
I'm stuck on this last part...am running a simple script under AIX to extract NetView host IP addresses. The line below returns the IP address in parenthesis with a trailing colon, i.e.
ping -c 1 $name |grep \( | awk '{ print $3 }' --------> returns
(a.b.c.d):
How can I only... (10 Replies)
Hi ALL,
I'm new to this forum.
Thanks and congrats to all for their great efforts building this site simply superb for all unix administrators.
My requirement is to remove extensions of the files in the current directory. I'm doing it using below script which is working but i think it is... (12 Replies)
hi:
i have several thousand files from users and of course they use all kind of characters on filenames. I have things like:
My special report (1999 ) Lisa & Jack's work.doc
crazy.
How do I remove all this characters in the current dir and subdirs too?
Thanks. (3 Replies)
Hi all,
I have this basic script to remove, in this case 9 characters from the end of a file name. This is what I have so far,
for file in *.mov
do
newname=`echo $file | sed 's/\(.*\)........./\1/' `
mv "$file" "$newname"
done
The problem is that it removes the file extension as well.... (2 Replies)
Hello,
I got files full path in a text file like that
/main/k/kdelibs/kdelibs4c2a_3.5.10.dfsg.1-2ubuntu7_i386.deb
/main/k/kdelibs-experimental/libknotificationitem-dev_4.3.2-0ubuntu1_i386.deb
/main/k/kdemultimedia/dragonplayer_4.3.2-0ubuntu1_i386.deb... (13 Replies)
Hi,
I have some files with some extension e.g. abc.xml.REMOVE,xyz.xml,efg.xml.REMOVE .
I have to remove the .REMOVE extension. I can display it using the below script but cannot rename it.
ls -l|sed 's/\.REMOVE//'
How can I rename this?
Thanks in advance (7 Replies)
Hi, I need a bit of help.
I've used awk to get the first 7 characters of a file -
awk '{print substr($0,0,7)}' test.csv
How do I now take this variable to rename test.csv to variable.csv ?
Any help or advice would be greatly appreciated! (2 Replies)
Hi all
i am new for the shell scripting can any one help me with my requirments . i want to delete file older than 21 days everything works fine but in that dir i got the files with should not be deleted with particular extension like (.info):confused:here is the script i wrote .can anyone... (5 Replies)
Hi All!
Please can someone help, I have a dir with the following files:
~-rw-r--r-- 1 emmuser users 2087361 Oct 16 15:50 MPGGSN02_20131007234519_24291.20131007
-rw-r--r-- 1 emmuser users 2086837 Oct 16 15:50 MPGGSN02_20131007233529_24272.20131007
-rw-r--r-- 1 emmuser ... (7 Replies)
Hello,
I am trying to print searched multiple keywords in multiple files.
It is almost okay with the code but the code puts filename in front of each line.
How may I get rid of it?
-grep -A1 'word1' *.txt | grep -A1 'word2' | grep -A1 'word3'
I expect:
Real outcome:
How may I... (3 Replies)
Discussion started by: baris35
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)