Dear all, I have downloaded the latest version of gcc --- gcc-3.3.1.tar.gz from gnu.org. My Linux distribution is Mandrake 9.0. This was how I installed it:
su -
passwrd:
mkdir /usr/local/src
cd /usr/local/src
gunzip /tmp/gcc-3.3.1.tar.gz #where I downloaded the file
tar xvf... (2 Replies)
:) dear members;
I am trying to placea directory to keep minor records in particular directories.. rather than just rely on hard links.. I would like to set the $PATH variable so that I can access the directory itself from anywhere; ex./ /tmp or /bin /var...
I know how to export enviromental... (4 Replies)
Hi there,
I need help on setting the path variable. How can I set the path variable with Bourne Shell. My scripts goes like this, but did not work.
#!/bin/sh
PATH=/usr/bin:/usr/ucb:/etc:/export/home/zchen/home
export PATH
Thanks,
Z (4 Replies)
Hi all,
I have a java command in a shell script.
When i m executing the command from the prompt its working fine. But when i paste the same command in a shell script and execute the shell script it says path not found. Please help. (5 Replies)
In emacs elisp, there is a handy function called file-name-nondirectory which accepts a path and file name and returns just a file name and extension. There is also a function called file-name-directory which just returns the dire ctory name without the file.
How can I implement these same... (2 Replies)
hi i wrote following script,
#!/usr/bin/sh
for index in `ls /tmp/common/*.txt`
do
echo "$index"
done
here index is giving full path but in my program i want only file names (not along with whole path)
Eg. if in /tmp/common files are a.txt and b.txt den out should be a.txt b.txt
... (6 Replies)
I have the following script "test". When i tried to execute it, I am not able to run it. I dunno why ? Then i tried getting the first few lines of the script which is displayed below:
$head -10 test
#!/bin/ksh
PROG=$0;export PROG
ORAUSER=`get_inf_env INFORM_DB_ACCOUNT`;export ORAUSER... (13 Replies)
I have this piece of code
printf '%s\n' $pth*.msf | tr ' ' '\n' | sort -t '-' -k7 -k6r \
| awk -F- '{c=($6$7!=p&&FNR!=1)?ORS:"";p=$6$7}{printf("%c%s\n",c,$0)}'
When I run it I get
/home/chrisd/tatsh/branches/terr0.50/darwin/n02-z30-dsr65-terr0.50-dc0.002-8x6drw-csq.msf... (8 Replies)
Hi all,
This is probably a very simple question but I couldn't even think of how to phrase it intelligently so google could tell me the answer.
Basically I am a user on a server, I am not the admin and do not have root privileges. I have downloaded a bunch of programs that I need to use and... (2 Replies)
Discussion started by: DavyK1984
2 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)