i am studying a script which is used for data loading.
it has functions which deletes all the existing data before loading and then loads new fresh data.
but i am stuck up at function Replace into table ( col 1,col 2....)
Does this signify All Inserts. (1 Reply)
I have a 1 million record file and in there i have 580 bad records meaning like they were spread on to 2 lines and is making my process fail as it is expecting single line records. How can i correct this records spread into 2 lines into single line or how i can writer these records into a new... (34 Replies)
Hi everyone!
Can you please help me with some shell scripting?
I have an input file input.txt
It has 3 columns (Time, Event, Value)
Time event Value
03:38:22 A 57
03:38:23 A 56
03:38:24 B 24
03:38:25 C 51
03:38:26 B 7
03:38:26 ... (7 Replies)
I could not find this on the search..
I want to know how to trim a row
so lets say I have a file that looks like this:
bob 88888888888888
and I want to trim column 2 (lets say 4 off the front and end)
bob 888888
Also, how would I bin column 2
Lets so I want to add and average... (1 Reply)
Hi I have a file that I want to bin.
I am using this code:
awk -F'\t' -v r=40 '{for(i=r;i<=NF;i+=r){for(j=0;j<r;j++){sum+=$(i-j)}printf "%s ", sum/r;sum=0}; printf "\n"}' file1 > file2
So basically what this code does is that it will averaging every 40 columns (creating bins of 40). But... (2 Replies)
Hi all,
suppose i have one file and in that file there are thousand of record like below . if i want to fill the bold position below with some value suppose 000000 then how it would be in shell script
... (1 Reply)
Hi All,
I'm having a problem tabbing the data. can you please help me tab the data. i used sed but it's not working.
ex.
BUNDLE1MB(6spaces)|Y|ng_oliv10@shellscript.com.ph(6spaces)562.60.61.20(6spaces)562.61.35
here's my code
sed "s/ //g" Userid_dsl_npm.txt__200 | sed "s/ |/ /g" |... (2 Replies)
Hello
I have a text file with tens of thousands of rows
The format is
x y
where both x and y can be anything between -100 and +100.
What I would like to do is have a 3d gnuplot where there are 10,000 squared or bins and each bin will count how many rows have a value that would be... (1 Reply)
Discussion started by: garethsays
1 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)