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The UNIX and Linux Forums
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One of the things that I have learned to take for granted in the Win32 world is the cut, copy and paste hotkeys of ^X, ^C and ^V.
I use these keys all the time under Win32 to copy and paste information from one GUI into another GUI.
My question is, does X have a similiar standard?
... (4 Replies)
hi i am new to shell scripting,
i have been trying to cut columns numbered 1,4 of a file consisiting of 4 columns. Each column is seperated by 2 spaces.
for example:
john 6102097199 tennessee usa
michel 6734590899 texas USA
now, i need to cut the name... (3 Replies)
Hello
I have a very large file where say each line is made up of 80 characters.
I want to cut the characters from 20-30 and 50-60 from each line and then insert a delimiter between them (# or | etc).
eg
input file
000000000131.12.20990000590425246363375670011200140406... (5 Replies)
Hi i need a favour
i have a file which has some trillions of records. The file is like this
11111000000000192831840914000000000000000000000000000
45789899090000000000000000011111111111111111111111111
I want to cut specific postions in each line like cut1-3 and assisgn it to a variable and... (5 Replies)
Hello,
I want to be able to cut and paste columns from two tables in one command.
Presently I do the following:
cut -f 1,3-6,9 table1.in > table1.out
cut -f 7,6,1-3 table2.in > table2.out
paste table1.out -d '\t' table2.out > MergedTable.out
Is there a better way to do this?
... (1 Reply)
Hi,
Need a help with shell script. I have to search for a string in one of the file, if match found, copy the line to a new file and delete the line from the exisiting file.
eg:
83510000000000063800000.1800000.1600000.1600000.2400000.1800000.2000000.21... (6 Replies)
Hello,
I am working on unix for the first time.
I have to write a shell script where i want to cut paste from one file to other.
File "1234.abc" is
03,12345555
16,936,x,x,120
16,936,x,x,100
49,12345555
03,12347710
16,936,x,x,115
16,936,x,x,122
49,12347710
03,12342222... (9 Replies)
I have a file which contains 3 fields separated by tabs example
andrew kid baker
I need to swap kid and baker using cut and paste commands how is this to be done?
Thanks (3 Replies)
let i have A file and B file
A has contains 4 fields as below
----------------
f1 f2 f3 f4
B file consists of 5 fields as below
--------------------
f5 f6 f7 f8 f9
need to display as below output:
f5 f1 f3 f8 f9 (2 Replies)
Hello,
I have some problem in cut or paste command for my text data.
Input1.txt :
I use cut command :
cut -d ' ' -f1 Input1.txt > result.txt result.txt :
Then, I use paste command to merge result.txt.
paste -d ' ' result.txt Input1.txt > output.txt output.txt showed :
I use cut... (1 Reply)
Discussion started by: awil
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)