To anyone who can help greetings,
I am a beginner at Unix shell scripting and am taking a class.
The assignment question is as follows:
use a command-line tool named "itstat" which will display the resolution of an image file and some other lines of information. It accepts a list of image... (1 Reply)
To anyone who can help greetings,
I am a beginner at Unix shell scripting.
I need to know how to use the command line tool "itstat".
I understand it's application, however I cannot find any additional information.
Any assistance will be greatly appreciated. (3 Replies)
Hi all!
I'm a newbie to shell scripting.
I want to create a script that will store a line from a text file in a variable so I can then use it to open firefox with that text in the address bar (the text file contains a list of addresses).
I have tried the following:
#!/bin/sh
a='sed -n 2p... (2 Replies)
Hi,
I am assaigning the output to the variable outp and when i try to loop thru the variable i see the original content $OUTPUT also in the array outp.
I dont want to have the original content in the array outp.
Please reply.
outp=$(echo $OUTPUT | awk '{FS = "|"}{
for(i=0;i<NF;i++)... (8 Replies)
HI all,
I am attempting to use the scp statemet in a shell script that I am writing
I need to have the user of the script enter a password at the time of the shell script running.I have the following questions?
1) how do i disable the automatic text echo when the user is entering the... (1 Reply)
Hello,
I have a scenario for which I am trying to write a shell script and I have a question regarding the same. Here's the situation:
I am trying to copy a directory which consists of a few sub-directories and .c and .dat extension files say n number of times so that the copied file have... (3 Replies)
Hi,
I need to write a script that runs a series of commands in multiple subfolders. The problem is that I dont want to change directory for every folder. So this is why I thought to use a master script to activate the smaller ones.
So, is there a way to command other scripts to open in... (9 Replies)
Hi guys,
I am wanting to create a script that will logon to HackThisSite.org and complete Programming Mission 11. You can find a link to this mission here for your reference:
www hackthissite org/missions/prog/11/
The following is what I have so far:
#!/bin/bash
USER="myUsername"... (0 Replies)
hey i have to connect to sql through shell script , then store the value of the query in a variable and then compare it after some time after running a process.
i have used this code but it is not working.
#!/bin/sh
Val = (sqlplus -s rte/rted2@rel76d2 <<!
SELECT MAX(STAT_ID) FROM CVT_STATS;... (3 Replies)
I tried to run a command which simply generates SSH key with out prompting password.
After several trails , got the below command to run the script :
ssh-keygen -t rsa -N "" -f id_rsa
-N "" tells it to use an empty passphrase (the same as two of the enters in an interactive script)
-f... (0 Replies)
Discussion started by: ulaxmi
0 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)