I am a beginner at shell scripting, actually i am working on my first script right now.
Anyway i have searched the world how to grep two letters from each word (it will always just be two words).
For example:
Example Blablabla
I want my script to cut out Ex (from the first word) and Bl... (4 Replies)
Hi
Is there a way to cut the last two characters off a word or number given that this word or number can be of varying length?
I have tried something like
TEST=`echo $OLD | cut -c 1-5`
where $OLD is a variable containing a number like 1234567 which gives a result of 12345. This is fine... (4 Replies)
I have been reading for a few hours trying to educate myself enough to accomplish this task, so please know I have performed some research. Unfortunately, I am not a *NIX scripting expert, or a coder. I come from a network background instead.
SO, here is my desired outcome. I have some Cisco... (5 Replies)
hi people,
I have a text file containing data, seperated by TAB. I want to process this tab'ed data as variable. how can I assign this?
Ex:
Code:
11aaa 12000 13aaa 14aaa 15aaa 16aaa 17aaa
21aaa 22000 23aaa 24aaa 25aaa 26aaa 27aaa
31aaa 32000 33aaa 34aaa 35aaa 36aaa 37aaa... (1 Reply)
I have this filename "RBD_EXTRACT_a3468_d20131118.tar.gz" and I would like print out the "yyyymmdd" only. I use this command below, but if different command like cut or print....etc. Thanks
ls RBD_EXTRACT* | sed 's/.*\(........\).tar.gz$/\1/' > test.txt (9 Replies)
Hi
I am having a csv file like this
ahsh,90.82,add,32424,ahha
hhdh,98.89,hdhdh,92728,neha
hshs,you,97.7,hdhdhd,are,a
jsjsj,wonderful,9788,79.9,aheh
ahdh,95.5,girl, 2737,jolllI need to add width="100" to the value which is greater than 90 like decimal points but less than 100
Output... (5 Replies)
Discussion started by: kshitij
5 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)