I need to find out when a file has been created. 'ls -l' just lists the last date the file was modified, not the creation date. I have also noticed when viewing the attributes through NT, the last modified date is the same as the file creation date. I thought maybe this was a fault due to Samba.
... (2 Replies)
Hi,
I'm trying to assign the permissions, owner and group of a file to seperate variables, but using
ls -l filename | awk '{print $1 "\t" $3 "\t" $4}'
gives the owner as tom.ja instead of tom.james
Is there any way to expand it so i get the full name, or is there an easier way to get them... (5 Replies)
hi,
I want to know the date the file was created or modified. I can do this using ls, ll -ltr etc...
I want to do this in a function (so If the file date is older then a week I can report it), is there a way?
another thing...
In sql function, I can catch exceptions, is there a way to do this... (1 Reply)
Hello Folks,
I want to generate the file attributes of the system and needs to write into the text file.
I am running the command "ls -Rl" to get the details of the files from the current directory.
I am getting the output.
./linux-2.6.29.4/arch:
total 10
drwxr-xr-x 9 1138 5000 ... (3 Replies)
Hi,
Is there a way to use cp in such a way that when a file is copied to a destination, the required destination folders are automatically created with the proper permissions, and the resulting copied file has the same attributes as the original. For example if I copied... (1 Reply)
Hi,
I am new to shell scripting.
I have a file which has multi valued attributes. I wanted to split it so that there will be no muliti valued attributes.
Example file:
"attr1","amv1;amv2;3","bmv1;bmv2","abc","abc1;abc2;abc3"
Plz note this is CSV file and ; is the delimiter for multi valued... (7 Replies)
Hello,
I opened a file by accident (with a java program, which has been uninstalled!) and from then on, all the file with .fasta extension has been changed with an icon (So annoying!!) and the file attributes has been changed with the property:
Type: application/x-wine-extension-fasta type... (6 Replies)
Discussion started by: yifangt
6 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)