Hi,
I want to select columns from multiple files and combine them in one file. The files are simulation-data-files with 23 columns each and about 50 rows. I now use:
cut -f 11 Sweep?wing-30?scale=0.?0?fan2?.txt | pr -3 | awk '{printf("\n%s\t%s\t%s",$1,$2,$3)}' > ../Data_Processed/output.txtI... (1 Reply)
I have several files that are being generated every 20 minutes. Each file contains 2 columns. The 1st column is Text, 2nd column is Data.
I would like to generate one single file from all these files as follows:
One instance of 1st column Text, followed by 2nd column Data separated by... (5 Replies)
Dear Gurus,
I am very new to UNIX. I appreciate your help to manage my files.
I have 16 files with equal number of columns in it. Each file has 9 columns separated by space. I need to compare the values in the second column of first file and obtain the corresponding value in the 9th column... (12 Replies)
I'm trying to combine colums from multiple file to a single file but having some issues, appreciate your help.
The filenames are the same except for the extension,
path1.m0
---------
a b c
d e f
g h i
path1.m1
---------
m n o
p q r
s t u
File names are path1.m
The... (3 Replies)
Hi All,
I have 7 files, each containing 9 columns separated by space. I want to extract the 9th columns from every file and save in a new file. The columns must be pasted next to each other. And the title of each columns should be the name of the corresponding files! Since the 3rd column is... (1 Reply)
Hi friends,
My file is like:
Second file is :
I need to print the rows present in file one, but in order present in second file....I used
while read gh;do
awk ' $1=="' $gh'" {print >> FILENAME"output"} ' cat listoffirstfile
done < secondfile
but the output I am... (14 Replies)
Hello Unix gurus,
I have a large number of files (say X) each containing two columns of data and the same number of rows.
I would like to combine these files to create a unique merged file containing X columns corresponding to the second column of each file (with a bonus of having the first... (3 Replies)
Hi all,
I've multiple files. In this case 5. Space separated columns. Each file has 12 columns. Each file has 300-400K lines.
I want to get the output such that if a value in column 2 is present in all the files then get all the columns of that value and print it side by side.
Desired output... (15 Replies)
I have data of an excel files as given below,
file1
org1_1 1 1 2.5 100
org1_2 1 2 5.5 98
org1_3 1 3 7.2 88
file2
org2_1 1 1 2.5 100
org2_2 1 2 5.5 56
org2_3 1 3 7.2 70
I have multiple excel files as above shown.
I have to copy column 1, column 4 and paste into a new excel file as... (26 Replies)
Discussion started by: dineshkumarsrk
26 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)