09-19-2011
10 More Discussions You Might Find Interesting
1. Programming
Hi,
This is the first time, i am doing UNIX & C stuff.
I have written one funtion like
#include <stdio.h>
seq(num)
int num;
{
int i,sum;
for (i=1; i<=num;i++)
sum+=i;
return(sum);
}
this seq funtion should have return values to unix script.
like
.. (4 Replies)
Discussion started by: sundarm
4 Replies
2. Shell Programming and Scripting
hi all
im working in tcsh shell.
In sh shell i write for example:
case in $www
1 | 2 | 3)
arguments;;
4 | 5 | 6)
arguments;;
esac
can anybody tell me the equivalent to tcsh of
1 | 2 | 3)? (2 Replies)
Discussion started by: micromicrin
2 Replies
3. UNIX for Dummies Questions & Answers
hi Gurus,
I'm a newbie in scripting please check my script if this is correct. I think there's something wrong with it but I;m not sure. I'm trying to create multiple lines using awk from external xml files but i want to add additonal info in the data manually
Since i don't knwo how to... (0 Replies)
Discussion started by: sexyTrojan
0 Replies
4. Shell Programming and Scripting
is it possible to use multiple conditions in a CASE statement? And if so, what is the syntax? I'm trying to use one but can't seem to get it right. I want the statement to be
CASE $vendor OR $alias
condition 1) statements;
condition 2) statements;
etc.
esac
but I keep... (25 Replies)
Discussion started by: Straitsfan
25 Replies
5. Shell Programming and Scripting
Hi experts,
I am totally stuck with this.
I run a looping "for" command for multiple directories, manually, I have done this :
vfor dir in A B; do
cp -p $dir/X.txt X-${dir}.txt
done
where A and B is directory name.
However, I need to run for many directories.
So I have tried this :... (7 Replies)
Discussion started by: guns
7 Replies
6. Shell Programming and Scripting
Hi all,
I am attempting to create a shell script to optimize some routine process.
I want this script can let user select the actions they want to do.
But I met a problem that my script can only read one input and then do one action.
Is it possible to let my script to run more than one... (2 Replies)
Discussion started by: kaiya
2 Replies
7. Shell Programming and Scripting
complinagetest () #function name
{
if ;then
rm complins.dat
fi
touch complins.dat
i=0
while read line
do
if ; then
va=`grep -w "$line" datalins1.dat | awk BEGIN'{FS="\`~"}{if ( $3=="'$line'" ) {print $4}}'`
i=$(($i+1))
varits=$(echo $va|awk -v varif="$i" '{print... (1 Reply)
Discussion started by: amitpaul01
1 Replies
8. Shell Programming and Scripting
14`~abc`~9`~11
14`~abc`~9`~10
36`~ee`~7`~9
36`~ee`~8`~9
58`~rtt`~12`~7
70`~gff`~13`~8
86`~tyu`~6`~12
86`~tyu`~6`~13
92`~mjh`~5`~6
28`~jkl`~10`~DNA
32`~mjk`~SNA`~5
82`~jkli`~11`~DNA
------------------------------------
Field Seperator: `~
The concept is to start with SNA in the 3rd... (8 Replies)
Discussion started by: barath
8 Replies
9. Shell Programming and Scripting
Hello friends,
I want to run this code on every document in every sub-directory.
tr -d '\n' < MulitpleInput.txt | awk '{gsub(/\. /,".\n");print}' | grep “\
I tried several looping techniques but couldn't get it to run in this example. Any ideas?
Thank you (2 Replies)
Discussion started by: danbroz
2 Replies
10. Programming
Not sure if this is possible, but I've tried this about a thousand ways now. I am making something with a lot of arrays. I thought I could put the array names into a separate array and then loop through them to call all of their elements. This is the best I've got so far:
#include <stdio.h>... (4 Replies)
Discussion started by: Azrael
4 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)