I use the following as part of a script to correct for a faulty hostname file.
The code works fine, but it always adds a blank line at the end of the hostname file. (the extra is noticed by an additional byte as well as in notepad++.)
It does not appear to be a real problem, since it doesnt actually affect anything else. But I would like the script to be more precise and not add anything.
Am I using sed incorrectly? Is there a switch that would prevent it from adding the newline?
I followed the egrep example given in the thread "parse text or complex grep ?". It is exactly what I need...except... how do I insert a blank line after the second line? My exact command is:
egrep 'patt1|patt2' filename
the result is:
patt1
patt2
patt1
patt2
and so on. I would... (2 Replies)
Hi,
I want to write a sed script which from
batiato:
batiato/giubbe:
pip_b.2.txt
pip_b.3.txt
pip_b.3mmm.txt
bennato:
bennato/peterpan:
123.txt
consoli:
pip_a.12.txt
daniele: (2 Replies)
HI, I have this list of apps like so:
DivX Products.app
DivX Support.app
Uninstall DivX for Mac.app
Build Applet.app
SpringBoard.app
Interface.app
MobileAddressBook.app
MobileSafari.app
MobileSlideShow.app
Preferences.app
Install Flash Player 8 OSX.app
Yap.app
check_afp.app
... (10 Replies)
I am trying to use wget and sed to extract a text based weather forecast for the Greater Victoria area only, this is one paragraph of many in a web page. I have tried /^$/ but that does not seem to work. So far I get mostly what I want with this:
wget -qO -... (2 Replies)
Hello friends,
I have a C source code containing sql statements. I use the following sed command to print all the sql blocks in the source code....
sed -n "/exec sql/,/;/p" Sample.cpp
The above sed command will print the sql blocks based on the pattern "exec sql" & ";"... (2 Replies)
the following range matching works great but i wish to add a blank line after each range result set... which i've tried and researched to no avail
MY INPUT DATA:
CURRENT CODE I'M USING:
sed -n '/*$/,/;/p' $INPUT_FILE
RESULTS I'M GETTING:
RESULT I looking to... (5 Replies)
Hello...
I have a file which contain certain number of records.
I want to generate another file from this file which will contain 1st line as a blank line & after every 5 lines one blank line will be inserted. How to achieve this through shell scripting?
Thanks... (5 Replies)
Hello.
I have a config file (/etc/my_config_file) which may content :
#
# port for HTTP (descriptions, SOAP, media transfer) traffic
port=8200
# network interfaces to serve, comma delimited
network_interface=eth0
# set this to the directory you want scanned.
# * if have multiple... (6 Replies)
Hi Guys,
I am stuck in between and seeking help here.
Requirement: A script that will run every morning which will connect to Mysql database and run the query to inform us about the holidays (it will also check if there were any holidays during last 2 business days). So the three queries are... (11 Replies)
Discussion started by: Sambit Sahu
11 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)