Hi all,
im a linux newbie, plz help!
I have a file -
box
--------
Fox-2
--------
UF29
zip42
--------
zf-CW
SNF2_N
Heli_Z
--------
Fox
--------
Kel_1
box (3 Replies)
Hi,
I need to extract <APPNUMBER> tag alone, if the <college> haas IIT Chennai value. college tag value will have spaces embedded. Those spaces should not be suppresses.
My Source file
<Record><sno>1</sno><empid>E0001</empid><name>Rejsh suderam</name><college>IIT ... (3 Replies)
Hi
i am in learning phase of unix
i am able to understand basic of awk but not able to understand Pattern-Specific Actions in awk below is the snippet .
awk '
/ *\$*\. */ { print $1,$2,$3,"*"; }
/ *\$0\. */ { print ; }
' fruit_prices.txthere i am not getting the use of wild card. what... (4 Replies)
Hi,
I'm trying to replace a string with sed, in a text file containing this pattern:
location alpha
value x
location beta
value y
location gamma
value y
location delta
value y
location theta
value z
...
What I want to achieve is:
Find location beta into text file... (1 Reply)
Hello All
I'm trying to change one string from a file contening this patern:
xxxx-xxxx
4 numbers - end 4 other numbers
This is a sample of the file:
LDR 00679 am a2200205 4500
=001 3617
=008 030219s2000\\\\xxx|||||\||||\00|\0\spa\d
=020 \\$a0211-1942
=041 \\$aCastellà
=093 ... (5 Replies)
Gents,
I am trying to delete all lines which start with "H" character, but keeping the fist header. Example In the input file I will delete all lines starting from line 8 which contents character "H" to the end of the file.
I try
sed '8,10000{/^H/d;}' file
But as don't know the end... (1 Reply)
Hi
This is my first post and I'm just a beginner. So please be nice to me.
I have a couple of html files where a pattern beginning with "http://www.site.com" and ending with "/resource.dat" is present on every 241st line. How do I extract this to a new text file?
I have tried sed -n 241,241p... (13 Replies)
Hi guys,
I am running a while loop in a script ro read a file line by line.
Now I want to run a grep only on the lines below the line I am that is being read by the while loop.
Eg:
If my while loop is on line 4 of the file, the grep only runs below line 4 and does not include line 1,2... (3 Replies)
Hello,
I need to cut a specific pattern from a line irrespecitve of knowing field place.
I am aware to cut field if you know the place of the field, but for me The sting place varies.
1468129514436,0,something_error,Non HTTP response code: java.net.URISyntaxException,Non HTTP response... (5 Replies)
Discussion started by: mirwasim
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)