03-10-2010
9 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I have a file which contains the following :
select * from test where test_id=1;
select id
from test1, test2 where test_id=1 and test_id=2;
select * from
test1, test2, test3 where test_id=4 and test2_id where in (select test2_id from test2);
select
id1, id2 from test ... (6 Replies)
Discussion started by: vrrajeeb
6 Replies
2. Shell Programming and Scripting
Hi all,
I am looking for a coomand to search for the keywords in susequenct lines. Keyword1 in a line and Keyword2 in the very next line.
Once i found the combination ineed to print the lines with patterns and the line above and one below.
I am giving an example here: Keywords are :ERROR and... (12 Replies)
Discussion started by: rdhanek
12 Replies
3. Shell Programming and Scripting
hey guys,
Hey all,
I'm doing a project currently and want to index words in a webpage.
So there would be a file with webpage content and a file with list of words, I want an output file with true and false that would show which word exists in the webpage.
example:
Webpage content... (2 Replies)
Discussion started by: Johanni
2 Replies
4. Shell Programming and Scripting
Hi Guys,
I have the following problem. I have original file (org.txt) that looks like this
module v_1(.....)
//arbitrary number of text lines
endmodule
module v_2(....)
//arbitrary number of text lines
endmodule
module v_3(...)
//arbitrary number of text lines
endmodule
module... (6 Replies)
Discussion started by: kaaliakahn
6 Replies
5. Shell Programming and Scripting
Hi all,
how to recursively search for a list of keywords in a given directory??
for example:
suppose i have kept all the keywords in a file called "procnamelist" (in separate line)
and i have to search recursively in a directory called "target/dir"
if i am not doing recursive search then... (4 Replies)
Discussion started by: neelmani
4 Replies
6. UNIX for Advanced & Expert Users
I have a huge list of files in an Unix directory (around 10000 files).
I need to be able to search for a certain keyword only within files that are modified between certain date and time, say for e.g 2012-08-20 12:30 to 2012-08-20 12:40
Can someone let me know what would be the fastest way... (10 Replies)
Discussion started by: virtual123
10 Replies
7. Shell Programming and Scripting
have a very big file where need to format it like below
example file:
abcd today
is
great
day;
search keyword 'abcd' and append to it all words till we reach ; to make it a single line.
output should look like.
abcd today is great day;
There are many occurrence of such... (2 Replies)
Discussion started by: giri4332
2 Replies
8. Shell Programming and Scripting
Hi ,
I have been trying to write a perl script to do this job. But i am not able to achieve the desired result. Below is my code.
my $current_value=12345;
my @users=("bob","ben","tom","harry");
open DBLIST,"<","/var/tmp/DBinfo";
my @input = <DBLIST>;
foreach (@users)
{
my... (11 Replies)
Discussion started by: chidori
11 Replies
9. Shell Programming and Scripting
I have ~100 text files in a directory that I am trying to parse and output to a new file. I am looking for the words chr,start,stop,ref,alt in each of the files. Those fields should appear somewhere in those files. The first two fields of each new set of rows is also printed. Since this is on a... (7 Replies)
Discussion started by: cmccabe
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)