Hi,
I'm currently trying to write a script that checks a log file for certain errors. Once checked it then records the filesize in another file. All this is fine, my problem is that the next time I do my error check I only want to check from previously recorded filesize to the end of file. I'm... (2 Replies)
I want to check the files in particular directory are more that 0 Bytes i.e, Non zero byte file. The script should print a msg if all the files in that directory are empty( 0 Byte). (2 Replies)
Hi All,
I am very new to Shell scripting...
I got a requirement.
I will have few text files(data files) in a particular directory. they will be with .txt extension. With same name, but with a different extension control files also will be there. For example, Sample_20081001.txt is the data... (4 Replies)
Hi
I need to check the file,if file exist ,do some other opearations and make it successful.
If file does not exist skip all steaps,go to last step and make it succesful.below is scripts is working for file exist but its not working for file not exist
... (0 Replies)
All,
Is there a way to keep checking for a file over and over again in the same script for an interval of time?
Ie
If {
mail -user
continue checking until file arrives
file arrives
tasks
exit
I don't want the script to run each time and email the user each time a file... (4 Replies)
I was wondering if there is a way to to check if two files are the same. I've tried writing a script called samefile, which takes in two arguments (files) and attempts to compare them to see if they're the same file.
Here is what I have so far:
if
then
echo "The two files are not the... (4 Replies)
Hello Experts,
File contains 5 columns with | delimeter. 1,3,5 columns are required columns means it should contains values.
reset of the columns it will contain value or not.
test1.txt:
Code:
a@a.com|a|b|c|d |a|b|c|d
output: test2.txt
Code:
a@a.com|a|b|c|d
I need the unix... (1 Reply)
Hello Experts,
File contains 5 columns with | delimeter. 1,3,5 columns are required columns means it should contains values.
reset of the columns it will contain value or not.
test1.txt:
a@a.com|a|b|c|d
|a|b|c|d
output: test2.txt
a@a.com|a|b|c|d
I need the unix script, read the... (5 Replies)
Hi,
I have 9 files which are generated dynamically & if there is a some condition which doesn't meet the criteria then file is not created or is of zero size.
so further i am unable to consolidate the files based on following code 1
awk -F, -v ptime="201407" 'FNR==1... (3 Replies)
HI Guys,
I have some 8 files with different name and extensions. I need to check if they are present in a specific folder or not and also want that script to show me which all are not present. I can write if condition for each file but from a developer perspective , i feel that is not a good... (3 Replies)
Discussion started by: shankarpanda003
3 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)