Hi,
I'm new to unix and i am kind of familiar with the basic commands.
can anyone suggest some good books especially for AWK scripting and SHELL scripting
thanks,
Hari (2 Replies)
I have a text file in which the text has been divided into paragraphs (two line breaks or tab marks a new paragraph) and I want to make a script which output would delete line breaks within the paragraph and the different paragraphs would be separated by two line breaks.
So, if my input file... (14 Replies)
Hi,
I am trying to understand what is happening here, new to scripting: I have a couple of these, but if I knew what was going on in one I can figure out the rest:
awk '/rpc-100083/ { $2 = "enable -r" }
$3 ~ /.NOS99dtlogin/ { $t = $2; $2 = $3; $3 = $t }
{ print }' /var/svc/profile/upgrade... (2 Replies)
Hi
I have 2 files of large size( 10 Miilions) , i want to join 2 files based on some condition .
for this taking lot of time and 100 cpu .i want to iterate the based on some value (like 1 lakh)
I put the 2 files in the associative arrays . if the array limit reaches the 1 lach join the with... (2 Replies)
Hi Experts,
I am adding a column of numbers with awk , however not getting correct output:
# awk '{sum+=$1} END {print sum}' datafile
2.15291e+06
How can I getthe output like : 2152910
Thank you..
# awk '{sum+=$1} END {print sum}' datafile
2.15079e+06 (3 Replies)
Hi, i am newbie to this site and hope to learn but problem is s but need help urgently.
Plz pm me if you are good at this.
Help will be appreciated. (11 Replies)
Hi,
This is the first time I am working with awk and I am not familiar with any commands in it. But I managed to do most of my work just left with one more. Needing your help!
I have to extract only the matrix (written within ) from a text file. For example:
1JTJ_0006_ACGC_NPNP_A_12_15.pdb ... (17 Replies)
hi all,
I am working on awk scripting.I have created two awk files and now have a requirement of replacing the contents of first file with some contents of second file.
Please find below the two files created.File1 has 3 records and File2 has 4 records.
cat File1
111,0165,CB21031251,0165,... (3 Replies)
Hi
I am beginner of shell/AWK scripting , can you please help me in select particular column and column between two pattern from a multiple column file.
file1.txt
number status date1 date2 description category ... (7 Replies)
I am trying to write a shell script that will add a date to and awk command from the command prompt.
here is the line I am having difficulties.
zgrep -i playback $dir/$1-*-errors.out.gz |cut -d '|' -f 1,11,12,15 | awk -v start=${start} -v end=${end} -F '|' '{$1>=start && $1 <=end} {print $2... (7 Replies)
Discussion started by: infinity0880
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)