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1. Shell Programming and Scripting
Hi,
I need to query Oracle database for 100 users. I have these 100 users in a file. I need a shell script which would read this User file (one user at a time) & query database.
For instance:
USER CITY
--------- ----------
A CITY_A
B CITY_B
C ... (2 Replies)
Discussion started by: DevendraG
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2. Shell Programming and Scripting
hi
i want to make script. where i want to query from the user yes or no
exp: do you want to proceed :
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how this is possible in unix (3 Replies)
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3. Shell Programming and Scripting
Hi,
I have a requirement as below which needs to be done viz UNIX shell script
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hi
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5. Shell Programming and Scripting
I would like to use the result of a query in another query. How do I redirect/add the output to another variable?
$result = odbc_exec($connect, $query);
while ($row = odbc_fetch_array($result)) {
echo $row,"\n";
}
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?>
This will output hostnames:
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6. UNIX for Dummies Questions & Answers
I just started to learn unix -
need help to write a script to query a logfile and produce the results that
contains a specific word "alarm" for a period from X day to Y day.
I really have no idea how to begin - :(
please help...
____________________________________________________
#... (1 Reply)
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hi friends i want to know details of `exec` exact use of this command .....
actually i went through the man page but i didn`t get the satisfactory ...conclusion....
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8. Shell Programming and Scripting
I have converted data written on excel sheet in unix through shell & perl prg
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hfgg|tytt|
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9. UNIX for Dummies Questions & Answers
hi,
how can i do the following.....
i have file containing followig
a k 10000
b c 200000
d e 50
a j 40
how can i list all rows containg last value more than 1000?
and how can i find number of blank rows in the file?
THANKS!
regards
vivek (2 Replies)
Discussion started by: vivekshankar
2 Replies
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)