10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi all - I'm completely stumped by a script I'm working on...
The short version is I have a file called 'lookup' and in it are hundreds of names (first and last). I have a script that basically allows the user to enter a name, and what I need to have happen is something like this:
Record... (8 Replies)
Discussion started by: sabster
8 Replies
2. Programming
Input file:
#data_1
AGDG
#data_2
ADG
#data_3
ASDDG
DG
#data_4
A
Desired result:
Highest 7
Slowest 1
code that I try but failed to archive my goal :(
#include <stdio.h> (2 Replies)
Discussion started by: cpp_beginner
2 Replies
3. Shell Programming and Scripting
i have a problem i am working on and am completely new to bash commands. I writing a script to read another file and output the max and Min number in the script. I must use variables to output the max and min numbers. grades = file with numbers in them.
This is what i got so far. Thank You in... (3 Replies)
Discussion started by: ctanner10126
3 Replies
4. Shell Programming and Scripting
Hello
Wondering if anybody can advise me how I can sort the below file so it only displays lines with the latest versions of an object? As you'll see some of the scripts listed in my file have more than one version number (version number is after the file extension). E.g. cdm_bri.pkb has... (2 Replies)
Discussion started by: Glyn_Mo
2 Replies
5. Homework & Coursework Questions
1. The problem statement, all variables and given/known data:
Display from a csv file, birthdays that occur today. If there are no birthdays today, the next one in the year.
2. Relevant commands, code, scripts, algorithms:
The csv file is ordered from older to younger (ie. the most recent... (8 Replies)
Discussion started by: Adzi
8 Replies
6. Shell Programming and Scripting
Hi All,
My file looks some thing like this,
File 1: -
A 10
B 30
C 5
D 25
E 72
F 23
now my requirement is to find the line with highest number in it, i;e the result should be
E 72
Thanks in Advance (1 Reply)
Discussion started by: balu_puttaganti
1 Replies
7. Shell Programming and Scripting
Howdy.
I know this is most likely possible using sed or awk or grep, most likely a combination of them together, but how would one go about running a grep like command on a file where you only try to match your pattern to the second field in a line, space delimited?
Example:
You are... (3 Replies)
Discussion started by: LordJezoX
3 Replies
8. Shell Programming and Scripting
Hi,
I am using below command to display the number of line, but its returning no of lines along with file name.
But i want only no of line in the variable p.
Please help me on this?
p=`wc -l "text file"`
echo "$p" (6 Replies)
Discussion started by: shivanete
6 Replies
9. UNIX for Dummies Questions & Answers
I'm trying to figure out how to display a certain line in a text file. I keep getting references to Tail and Head, and I know how these work, but i'm lost on how to find say the third out of the five lines and display only that.
I thought maybe grep could help, but that doesn't seem likely.
... (3 Replies)
Discussion started by: MaestroRage
3 Replies
10. Shell Programming and Scripting
Hi,
I have a file a.txt and it has values in it
Eg :-
I need to read through the file and find the number that is the greatest in them all.
Can any one assit me on this.
Thanks (30 Replies)
Discussion started by: systemali
30 Replies
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)