I have a csv file, contents are shown below:
How would I be able to remove the first 3 columns (csv file) from the file using vi or any other unix command.
Thanks,
Muthu
Last edited by radoulov; 08-24-2010 at 06:34 AM..
Reason: Added code tags!
Hi folks - hope you are all well.
I am trying to perform some pre-processing on a data file, to make sure it is in a valid format before performing a data upload.
Each row of data in the file should consist of 10 comma delimited fields.
Can anyone advise me of a sed/awk command that might... (2 Replies)
I have a file with only one field something like this :
213.45
220.65
240.47
345.67
320.45
I want to remove all spaces in between. Is there any unix command for that ?Thanks in advance.. (2 Replies)
hi all,
i have a file contain multicolumns, this file is sorted by col2 and col3.
i want to remove the duplicated columns if the col2 and col3 are the same in another line.
example
fileA
AA BB CC DD
CC XX CC DD
BB CC ZZ FF
DD FF HH HH
the output is
AA BB CC DD
BB CC ZZ FF... (6 Replies)
If I have a data test.txt with 1000 columns such as:
id sex gene1 gene2 gene2.dl gene3 gene4 gene4.dl .......
1 1 AA AT AT TT AT AT .......
2 1 AG TT TT TA AA AA .......
3 2 AA AT AT TT AT ... (2 Replies)
Hi all,
I have created a script which adding two columns and removing two columns for all files.
Filename: Cust_information_1200_201010.txt
Source Data:
"1","Cust information","123","106001","street","1-203 high street"
"1","Cust information","124","105001","street","1-203 high street"
... (0 Replies)
dear all,
i have a data looks like this (i have 3000 columns):
rs123 A T T G C C C C C C A A A A A A A A A A A ...
rs154 T T G C C C C C A A A A A A A A A A T T G ...
rs126 A C C C C C A A A A A A A A A A A A T T G ...
I want to remove all the space after the 2nd column and make the... (2 Replies)
I have a file like:
s_20331 803 1 1 5 1:2=0.00000000 1:3=0.00000000 1:4=0.11111111
s_20331 814 1 1 5 1:2=0.00000000 1:3=0.12611607 1:4=0.00000000I would like to remove the four characters "x:x=" from all columns containing them (in my actual file, there are 15 total columns (i.e. columns... (1 Reply)
Hi Every one, my requirement is to remove the null columns in line, comma delimiter used
For example,
A,11,20,30,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
B1,,,,,, gem,plum,kite,,,,gud,bad,,,,,,,,,,,,,
B2,kiing,kong,height,,,,,,,,,,,,,,,,,,,,,,,,,rak,,,,,,,,,,,,,
B1,,,,,,... (9 Replies)
I am writing an awk script to remove the last two fields in a pipe delimited file. The script that I have currently deletes the last two fields but each field is being printed on its own line in the output. I can't seem to get the rows to print out on the same line as the input data. This is what I... (4 Replies)
Discussion started by: chamuco666
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)