Hi guys.
Does anyone know if there is a mail command that will allow you to flag all mail items as being read? I've checked out the man mail pages, but can't seem to find what I'm looking for. :confused:
We are running UNIX AIX 5.2.
Thanks in advance,
Kev (3 Replies)
Hi all,
I have a file with over 10,000 line, but I would like to update/add some code number (such as 062 below) into the line with <phone number> below:
11111<name> john matin <name>
12345<phone number> 123456 <phone number>
34556 <address> 1234 lucky road <address>
11111<name> john... (7 Replies)
Dear all,
I'm have a sorted array like this:
177
220
1001
2000
2001
2003
2005
notice that 2002 and 2004 are NOT in array.
Then user input a number INPUT, our script should return OUTPUT value like this:
if INPUT is not in array => OUTPUT=INPUT
if INPUT is in array => OUTPUT is the... (4 Replies)
I have a list of servers in a file called serverlist like this
server1
server2
server3
i need to have them (with no trailing comma, the program does not like that)
server1,server2,server3
so far i have been using
HOSTS=/tmp/serverlist
HOSTS=${HOSTS:-$(grep -Ev "^#|^$"... (2 Replies)
Hi there,
As you know, we can group a list of commands in either (list) form or { list;}. I know the difference between the two. (list) make the command list to be executed in a subshell while the commands gathered in { list;} are executed in the current shell. My question here is about the... (1 Reply)
I have a dropdown menu built in perl tk (I am using active state perl). I want to select a value from the dropdown menu and I want to be able to perform some other actions depending upon what value is selected. I have all the graphical part made but I dont know how to get the selected value. Any... (0 Replies)
I have a combo.cgi here. this is linux environment
What i am going to do is this combobox will list down all the flatfile name in this /u/test/cgi-bin/List directory.
after that, i wanted it to open the flatfile and display the content of the flatfile into another listbox or textarea in this page... (0 Replies)
Hello,
I need to collect some statistical results from a series of files that are being generated by other software. The files are tab delimited. There are 4 different sets of statistics in each file where there is a line indicating what the statistic set is, followed by 5 lines of values. It... (8 Replies)
Hello,
I have a src code file where I need to uncomment many lines.
The lines I need to uncomment look like,
C CALL l_r(DESNAME,DESOUT, 'Gmax', ESH(10), NO_APP, JJ)
The comment is the "C" in the first column. This needs to be deleted so that there are 6 spaces preceding "CALL".... (7 Replies)
Discussion started by: LMHmedchem
7 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)