hi!
in awk, i have a file like this:
Trace1: WRIT,Trace2: BLAN,Trace3: BLAN,
-47.2120018005371,,,39815.4809027778
-46.3009986877441,,,39815.4809027778
-46.277000427246,,,39815.4809143519
-46.7389984130859,,,39815.4809259259
-46.3460006713867,,,39815.4809259259... (10 Replies)
Hello.
I have data in the following format (the spaces at the beginning of lines are included):
1 2
2 0.39621 0.00000
1 2
2 0.00000+-0.0000 *
1 2
... (5 Replies)
Hi,
I am new to shell scripting, i have requirement can any one help me out in this regrads,
in directory i have file like invoice1.txt, invoice2.txt in each file i have fixed number of columns, 62 in number but they are randomly arranged.like
for first file invoice1.txt can have columns... (5 Replies)
my $branch_email_e = $FORM{r_Branch};
my $hostbranch_email_e = $FORM{r_Host_Branch};
my $branch_email_f = $FORM{r_Direction_generale};
my $hostbranch_email_f = $FORM{r_Direction_generale_daccueil};
my $branch_realname_e = '';
my $branch_realname_f = '';
... (4 Replies)
Greetings,
I'm doing a process whereby I need to search for all filenames containing a given bit of text and grab the newest file from what may be 20 results. In a script I'm writing,
i've got a monster line to do the sort as follows:
find /opt/work/reports/input -name "*$searchtarget*" |... (4 Replies)
I have a script that runs once per month. It performs a certain task ONLY if the month is January, April, July, or October.
MONTH=`date +%m`
if || || || ; then
do something
else
do a different thing
fi
Is there a neater way of doing it than my four separate "or" comparisons? That... (2 Replies)
$ cat data
Do NOT print me
START_MARKER
Print Me
END_MARKER
Do NOT print me
$ cat awk.sh
start=START_MARKER
end=END_MARKER
echo; echo Is this ugly syntax the only way?
awk '/'"$start"'/,/'"$end"'/ { print }' data
echo; echo Is there some modification of this that would work?
awk... (2 Replies)
greetings,
to be clear, i have a solution but i'm wondering if anyone has a cleaner way to accomplish the following:
the variable:
LSB_MCPU_HOSTS='t70c7n120 16 t70c7n121 16 t70c7n122 16 t70c7n123 16 t70c7n124 16 t70c7n125 16 t70c7n126 16 t70c7n127 16 t70c7n128 16 t70c7n129 16 t70c7n130 16... (2 Replies)
Hi Folks,
I have just spent a couple of days resolving some problems at the remote DR data centre, sorting out the problems caused by the over zealous use of a Vacuum cleaner of all things.
We have a backup server a SUN V480R with a Storedge 3510 and expansion attached which suffered a... (6 Replies)
Discussion started by: gull04
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)