I understand the question 1 b) i.e. convert to uppercase the entire line but can't do 1 a) i.e. invert the case. Question 1 a) says (according to me) to change upper to lower case and vice versa.
I couldn't get the question number 2. i.e. numbering lines.
These questions are from the book "UNIX concepts and applicaions" by Sumitabha Das
Chapter 20, question number 20.4 and 20.11
Last edited by ravisingh; 03-30-2013 at 01:45 AM..
I'm doing a teaching ass't for a basic unix course for a local college and we have given the new students an assignment where they have to code 10 pages of html by hand using the Vi Editor (i know it's cruel)
The purpose of this exersize is to get them used to unix and vi commands and how the... (4 Replies)
I am new in hp ux and I want work with vi editor, but in hp ux vi editor the backspaes and del keys doesn't work.
how can I enable them.
thanks (3 Replies)
Hi,
I knw its a silly question, but am a newbie to 'vi' editor. I'm forced to use this, hence kindly help me with this question.
How can i paste a chunk 'copied from' a different editor(gedit) in 'vi editor'?
As i see, p & P options does work only within 'vi'. (10 Replies)
Hi All,
I am running a script , working very fine on cmd prompt. The problem is that when I open do crontab -e even after setting editor to vi by
set EDITOR=vi it does not open a vi editor , rather it do as below.....
/////////////////////////////////////////////////////
$ set... (6 Replies)
hello friends,
i wud like to get some suggestion for a Q i faced in an interview..........
the Q is...........
suppose a person is working on vi .the file is very large and he hasn't saved anything ........suddenly power goes off and system shuts down ...after power comes up the system is... (4 Replies)
1.) I am to write scripts that will be phasetest folder in the home directory.
2.) The folder should have a set-up,phase and display files
I have written a small script which i used to check for the existing users and their password.
What I need help with:
I have a set of questions in a... (19 Replies)
version info :
vi availabe with RHEL 5.4
I have a text file with 10,000 lines. I want to copy lines from 5000th line to 7000th and redirect to a file. Any idea how I can do this?
Note:
The above scenario is just an example. In my actual requirement, the file has 14 million lines and I want... (9 Replies)
I was looking through the topics and I wasn't sure if this was the best place to post this question:
I was wondering, out of curiosity, which software everyone was using to code their scripts in. I do mostly sh/ksh and my favorite has always been EditPlus because it is small, fast, yet powerful.... (409 Replies)
Discussion started by: yongho
409 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)