guys i need bit of help!!
i am writing a script which finds files that have not been accessed for a no of days and delete those files...the no of days value is inputted at the command line....
i am using the following :
find $1 -atime +7 -exec rm -i
in the second step i want to copy all... (2 Replies)
Hello fellas or ladies.
I am new on this site and new to the unix operating system. I have been working with UNIX and i love it so far, i learned some stuff and most of the beneficiary command but I need help renaming all the files in my directory and doing them one by one is just tiring.... (1 Reply)
Hello fellas or ladies.
I am new on this site and new to the unix operating system. I have been working with UNIX and i love it so far, i learned some stuff and most of the beneficiary command but I need help renaming all the files in my directory and doing them one by one is just tiring. is there... (3 Replies)
Hello Friends,
I am very new to scripting and currently have come across a situation where I need to create a UNIX script which would look for certain text in a file and then email me if it finds it.
I am trying to trouble shoot an issue with our internet websites and I need to know when I... (1 Reply)
Hi,
My task is to check the file test.txt every 15 min from Mon-Fri 9:00AM - 6:00PM. We get this file from our mainframes, every 15 min it will update the same file.
My task is to compare file timestamp with current system time stamp and check if the file is updated or not.
If the file doesn't... (0 Replies)
Hi All,
I have a conf file and it has two entries seperated by comma, look like :-
best1,ls /opt/bmc/Patrol3/*/best1
......, .......................
In which "Best1" is the product name and "ls /opt/bmc/Patrol3/*/best1" is the way to find the product version of Best1 in that particular... (5 Replies)
Hi Guys,
I need help in scripting out the below :
this is a sample data i have in my file:
jobname type 8:00:00 AM
I need to remove the ":00" from the time field alone.
Thanks in advance for all ur help (8 Replies)
Hi folks,
need a small help
lets say i have a text file with the following content:
james
tom
jack
spielberg
i want to append text to the beginning of each line with a variable(lets says FirName:) and i want to combine all the names with a space in between and store it in another... (11 Replies)
Can anyone please help me to create the output file based on the attached input files using ksh script.
I have 2 input files
1) inputfile1.txt
2) inputfile2.txt
The script should accept 2 parametes:
1. Inputfile2.txt with 1-10,000 values ( sample file contains only 4 records)
2. Script... (5 Replies)
Discussion started by: vinus
5 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)