I'm really new at this and wondering how I would go about adding code to my script to verify that all records loaded successfully? (I am loading a file into a table) i'm using the Korn shell.
I'm also having trouble verifying parts in the header as i do not really understand the header and... (3 Replies)
Hi,
I have a script I want to run as a background process. Where would I add a bit of script so that a check can be performed to see it this is already running and, where it isn't, to then run it? I know how to do this... I just don't know where I can put the initial part of the check script so... (2 Replies)
Hi Group,
Please forgive in case this is discussed.
I need help regarding a simple script to verify if the give address exist in the Ldap directory. If the email exists the script should exit with a 0 status or else a non zero status.
I am currently using the following script (and it is... (4 Replies)
hello every body,
I have to verifiy if the param_key is selectionned twice or more and to print only one occurence i'm using htable what's the good implementation to add to the code to verify this.
code :
{
char *tmpStr = NULL;
ght_iterator_t iterator_param;
void... (0 Replies)
Hi,
I am from File system back ground and doing File system testing on Linux, I need script that scirpt that create the different multiple types of .txt, device file and then copy to mount point /mnt/ dir and then verify the created files and copied files, if created files and copied files are... (4 Replies)
Hi eveyone
I am planning to use crontab to delete all files in my donwloads directory that are older than one hour
I will be using crontab to run this script
find /home/kee/downloads/* -daystart -mmin +59 -type f -name -exec rm -r {}\;
could you please let me know if the above... (1 Reply)
hello i have writing a shell script to download and run some packages
the only way that i use to verify download pack is , limit users ip to download from main server, if wget can download file (verified) then script run by execute it sh pack76.sh
else show and error
(stupid solution ha?)
... (8 Replies)
Using ECDSA, how do you verify integrity of Data (D), Given the value for the following:
Random number (r)
Signature (s)
ECpublic Key (K)
Thanks. (0 Replies)
Hi guys!
Me again! ...
I'm trying to build (on MacOS directly) a bash script that will help me verify a SHA1 digest (to verify downloads and so on and so forth).
So first off, here's my version of BASH under OSX:
bash-4.4$
And here's my version of Sierra (macOS):
10.12.3 (16D32)
... (2 Replies)
Discussion started by: Ardzii
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)