12-20-2011
9 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Folks;
on a unix server I have a mapping file which holds a list mountpoints of all databases and their mountpoints. tab delimited or colon deliminted..I needed to copy the datafiles from the pristine mountpoints to test's mountpoints in this case. I needed to do this by passing sid name using... (18 Replies)
Discussion started by: jigarlakhani
18 Replies
2. Shell Programming and Scripting
Hello. I am a novince at writing shell scripts but here is the question. I have to write a shell script that does the following:
Once executed via crontab, the script should do the following:
a. get date/time stamp in for format 10-MAR-05 and
b. execute shell script my_script.sh (which... (2 Replies)
Discussion started by: jigarlakhani
2 Replies
3. HP-UX
Executed the following if conditions .. and got different results .
only (( )) gave correct o/p with all scenarios .
Can anybody please let me know what is the difference between and ] and ((condition)) when used with if condition.
And why each condition gave different result.
1.... (2 Replies)
Discussion started by: soumyabubun
2 Replies
4. Shell Programming and Scripting
hi,
I have some problems in my simple script about the redirect echo stdout command inside a condition. Why is the echo command inside the elif still execute in the else command
Here are my simple script
After check on the two diff output the echo stdout redirect is present in two diff... (3 Replies)
Discussion started by: jao_madn
3 Replies
5. UNIX for Dummies Questions & Answers
#Example.sh
alias rmv 'sh Example2.sh'
when i execute exapme.sh alias name not working.
how i solve this problem?? (9 Replies)
Discussion started by: arun508.gatike
9 Replies
6. Shell Programming and Scripting
Dear Community,
I've an urgent issue due to a migration of an application from HP-Unix to Linux.
We have a mass of scripts which are running at a dedicated server on hpunix.
Now we do not know, which further scripts exists on this machine. the idea is, that we crawl through the scripts we... (1 Reply)
Discussion started by: Alibapir
1 Replies
7. Shell Programming and Scripting
I am new in shell script i want to convert .txt file
in the format axsjdijdjjdk to
a
x
s
j
d
i
j
d
j
j
d
k (5 Replies)
Discussion started by: sreejithalokkan
5 Replies
8. Shell Programming and Scripting
HI
My doubt may be basic one but I need to get it clarified..
When i use "if" condition that checks for many AND, OR logical conditions
like
if ]; then
return 0
fi
Even the if condition fails it returns as zero.. Any clue..
But if i add else condition like
if ]; ... (2 Replies)
Discussion started by: Priya Amaresh
2 Replies
9. Shell Programming and Scripting
Dear Members,
I have the following situation I do not understand:
I have a large json encoded file which I need to grep and afterwards want to extract specific information.
I use this command to to that:
cat /tmp/file | awk -F '"fields":' '{print $2}' | awk -F '"description":' '{print $4}'... (6 Replies)
Discussion started by: crumble
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)