Say I do a date command and get the time from 15 minutes ago.
I have a text file with the date printed out every minute or so and I want to cut the file at the date stamp given to me by the 15 minute ago time stamp.
Is there an easy way to do this?
Example:
date +%M gives me 56
I... (2 Replies)
Let's say I have a line like that:
I want to cut out numbers between two $ including $s. The result should be like that:
I am so-newbei. I am non-stop reading about SED since yesterday and not a programmer. I know that it is a short period, thus maybe I had overlooked something. I... (4 Replies)
Hi,
I have text file which contains lines like :
a/a/a/a/.project
b/b/b/b/b/.project
c/c/c/.project
d/.project
e/e/e/e/.project
i want for all lines the last word .project should be removed and the file should look like :
a/a/a/a/
b/b/b/b/b/
c/c/c/
....
how to proceed... (7 Replies)
First I have to say thank you to this community and this forum. You helped me very much builing several useful scripts.
Now, I can't get a solution the following problem, I'm stuck somehow. Maybe someone has an idea.
In short, I dump a site via lynx and pipe the output in a file. I need to... (7 Replies)
Hi All,
I would like help with a script which can get rid of the first work of all lines in text file.
File 1
The name is Scott.
Output : name is Scott
---------- Post updated at 02:38 PM ---------- Previous update was at 02:37 PM ----------
Hi ALL
There is typo error in... (3 Replies)
Hi,
I got a line of text which has spaces in between and it is a long stream of characters. I want to extract the text from certain position. Below is the line and I want to take out 3 characters from 86 to 88 character position. In this line space is also a character. However when using cut... (5 Replies)
Looking for some help on using awk and cut
I have a text file that has fixed information and want to write a script that will prompt the user for an account to search for and pint the output
The sample line that has the key information looks like this:
Statement to: ... (5 Replies)
I have a file that i want to take only the first part of it and discard the rest, to be accurate,I need the first 137097 lines but I cant use split because I dont have enough space on my disck. I need sth to cut the file in its place (3 Replies)
Hello Friends,
I am stuck with the below problem.Any help will be appreciated.
I have a file which has say 100 lines.
On the second last line I have a line from which i want to remove certain characters..
e.g
CAST(CAST( A as varchar(50)) || ',' ||
CAST(CAST( B as varchar(50)) || ',' ||... (8 Replies)
Discussion started by: vital_parsley
8 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)