Hello ,
I am trying to print the footer of evry file in the given directory with xargs command like follows
ls -1 | xargs -I {} gzcat {} | tail -1
now problem with this is only last file foooter is getting printed as " | tail -1 " is getting executed for the last file.
I know this can... (4 Replies)
I want to log into a remote server transfer over a new config and then backup the existing config, replace with the new config.
I am not sure if I can do this with BASH scripting.
I have set up password less login by adding my public key to authorized_keys file, it works.
I am a little... (1 Reply)
Hi ,
I have a situation i need to write a while loop until the end of control file.In the control file i have a 5 lines which contains commands.how can i execute all with out waiting for the first one to complete.
Ex ControlFile:
ScripitName Test
ScriptName Test1
ScriptName Test2
... (1 Reply)
Hi,
I have one text file input.txt, which has folders path as follows:
/home/user/automate/abc
/home/user/automate/abc/xyz
/home/user/automate/test
/home/user/automate/test2
/home/user/automate/test2/abc/Main
In those folders i have .svn folder.
1) First i want to remove .svn like rm... (5 Replies)
:)hello people
i am working on some kind of PBX and i have list of telephone numbers inside a file, i have to insert these numbers into the correct command and then telnet to a remote server and execute these commands.
i can read the telephone numbers and insert them into the command with no... (0 Replies)
I made a configuration file for my shell script in that all the values that the shell scipt needs, are defined, but I don't know how to let the shell script use those defined variables.
Thank you for your help :) (3 Replies)
Hi,
I am facing issues with the below:
I have a lookup file say lookup.lkp.This lookup.lkp file contains strings delimited by comma(,).
Now i want to read this command from file and execute it.
So my code below is :
Contents in the lookup.lkp file is :
c_e,m,a,`cd $BOX | ls cef_*|tail... (7 Replies)
hi,
is there a way i can execute a batch file containing ftp commands like we execute sftp batch file.
sftp -b batchfile user@server > output
how to create a batch file for ftp executing command and how to run the batch file from a shell script? (2 Replies)
Hi,
I have one script for which I want that other user should not read the script file but can execute. Is there any method ?
I tried by giving 711 but it gives Permission denied to other users.
For Generic User id as a work around , I have created alias in .bashrc file and other user... (4 Replies)
Discussion started by: Amit Joshi
4 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)