dear all,
i want to copy all files in my home dir to another.
from my home dir i have given ls -la then
some hidden files are there with dot . .. and i also want to copy all dirs in my home as it is . because iam upgrading the system
how to copy all files and dirs in my home dir... (1 Reply)
Hi. I have a script which is deleting files with a particular extension and older than 45 days.The code is:
find <path> -name "<filename_pattern>" -mtime +45 -exec rm {} \;
But the problem is that some important files are also getting deleted.To prevent this I have decide to make a dummy... (4 Replies)
I want to backup all the directory tress, including hidden directories, without copying any files.
find . -type d gives the perfect list.
When I tried tar, it won't work for me because it tars all the files.
find . -type d | xargs tar -cvf a.tar
So i tried rsync.
On my own test box, the... (4 Replies)
I usually use ls -al | awk '{sum = sum + $5} END {print sum}' to sum the size of all files in a directory. However this command includes the hidden files.
Is there a command to just add up all the files/sub-directories excluding the hidden files (begins with . and ..)
I wanted to check the... (10 Replies)
Hi,
In one folder there is a hidden folder. Whenever i do any ls -a i can't see the folder. However i can get into the folder by cd .foldername.
Would you please help me to identify what is the problem here. (13 Replies)
I want to list all directories hidden or not hidden.
ls -ld */ => shows only not hidden directories
so i guess the answer would be to add the a option to show all files
ls -lad */ => not working :confused:
ls -la | grep "^d" => works
But I would like to know why I can't use ls -lad... (4 Replies)
I need to pull down a good bit of files for another support team for an upgrade project. I have a server.list with all of the server names.
I need to do two parts:
FIRST:
I have this example, but it does not list the server name in front of each line.
#! /bin/bash
for server in $(<... (10 Replies)
Hi,
I need to find a solution for backing up/transferring BACKUP (dump file) from AIX (specifically) to Windows 2012 Hidden Share.
The vendor says that he cannot do a copy from his system to hidden share because it requires a password...
Personally, I think that there should be a solution... (9 Replies)
Discussion started by: pob579
9 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)