Hi everybody,
Does somebody has a sample of script that control a daemon?
for example use loop until the daemon is on and if is not on
do something else?
Thanks
Pier (0 Replies)
hi all.
Please help me with archiving previous day syslog files.
the files have no extension and have the format YYYY-MM-DD.
I want to archive the file then move it to some other machine.
thanks. (2 Replies)
Hello
Today I had a beautiful test to write some commands using Ubuntu, now I want to make sure of my answers to be reassured, if I had a mistake please correct me
List all files details under ubuntu Desktop.
my answer:
cd Desktop |ls -l
Navigate to your Desktop directory and... (7 Replies)
Hello, I'm new to this forum, and I apologize in advance if I did something wrong here.
I am pretty stumped here as I am still getting the error message, "./comc1.sh: test: argument expected." after executing the script itself.
Here's the script file I modified:
I tried executing line 4... (1 Reply)
Hi,
I need a sample script to validate all the database objects like
1. table structure(columns, datatypes,key contraints if any)
2. synonyms
3. grants
4. indexes
....etc
thank you! (2 Replies)
hi all, I need some help in regards of how to process just a sample from a large .txt file
I have a large file from many new lines (say above 200.000 new lines), I need a script that process just a sample of it, say 10.000 bur a random sample (taking rows from top top to the the bottom)
... (4 Replies)
hi gurus ,
i want the command to get the output in the desired format .
basically to convert columns to rows.
please refer to the attachment. (3 Replies)
Sample shell script to add a user:
Today i learn how to add a user to linux server with a password.
#!/bin/bash
# Script to add a user to Linux system
if ; then
read -p "Enter username : " username
read -s -p "Enter password : " password
egrep "^$username" /etc/passwd >/dev/null
if ;... (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)