Hi ,
I am facing a problem .. which looks simple... but took 2 days of mine.. even now it is not solved completely..
I have one variable..., want to know whether that variable contains number... canbe +ve or -ve ...
Values
+35 --- number
-43 --- number
45A -- non number... (12 Replies)
Hi,
I have one file like 00123. And this file name is generated as a sequence.
So how can I confirm the generated file name is a number, not a special character or alphabets.
Can anybody help me out.
Thanks in advance. (3 Replies)
Hey,
I am trying to check if an integer is even in a tcsh script
This is what I am running now
set lattest = ` echo $latmin "%2" | bc -l `
echo $lattest
if ( $lattest == 0 ) then
echo "min is already even"
else if ( $lattest =! 0 ) then
set latmin = ` echo $latmin "+1" |... (2 Replies)
I have 2 and three params, both I should make sure thay numbers at one single line insted of checking for each one .
Example I wroote the following way.. checking for 2 and three seperately but I shud be able to do it at on statement
echo $2 | egrep '^+$' >/dev/null 2>&1
if ; then
echo... (2 Replies)
Hi,
We are getting a curios result in one of AIX script. Its executed using !/bin/ksh .
After following line we get result of 3 in in the variable instance_count.
instance_count=`ps -ef | grep "script_check_instances.sh" | grep -v "grep" | wc -l`
But once we do a "ps -aef | grep... (2 Replies)
Hi Gurus,
I need check existing number of file based on the list in file list.
for example:
in my file list. I have below:
abc, file1.txt
abc, file2.txt
abc, file3.txt
abc, file4.txt
cde, filea1.txt
cde, filea2.txt
cde, filea3.txt
...
in my current file direcotry, I have file:... (0 Replies)
Hello,
May i please know how do i check if the given input argument is one of the listed numbers then success else failure. I am using bash shell.
if
then
echo "success"
else
echo "failure"
fi
Thank you. (2 Replies)
Discussion started by: Ariean
2 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)