I want to execute below command using line number as a variable.
How do i substitute a variable in place of 5
for example
i tried substituting
but they didnt worked .
Please help
Hi all,
I need some help with sed command. I'm trying to move all the files with a modified date within 12:00 - 13:00.
What i'm doing here is to do is
ls -lt | grep 'Jun 22 12:' > list.txt
to get all file names within that period.
However how do i strip off
-rw-r--r-- 1 enfoot adi... (2 Replies)
Is it possible to process multiple variables in a single sed command?
I have the following ksh with three variables and I want to search for all variables which start with "var" inside input.txt.
I tired "$var$" but it just prints out everyting in input.txt and does not work.
$ more test.ksh... (5 Replies)
Hi,
Could you please explain me the below statement -- phrase wise.
sed -e :a -e '$q;N;'$cnt',$D;ba' abc.txt > xyz.txt
if suppose $cnt contains value: 10
it copies last 9 lines of abc.txt to xyz.txt
why it is copying last 9 rather than 10.
and also what is ba and $D over there in... (4 Replies)
Hi all
I am new babie to shell script, so please advise me n help me .
suppose i have a string "abacus sabre", i need to replace occurences 'ab' with 'cd' and i need to store this result into same string and i need to return this result from script to the calling function, where as the string... (4 Replies)
Hello, I need a smart sed command that can take any of the following two as an input and give below mentioned output. As you can see, I am trying to convert some C code
INPUT:
struct abc_sample1 {
char myString;
UINT16 myValue1;
... (2 Replies)
I have a requirement in my project to create report from a template file.
A sample template file is added below:
The report data is stored in a file. A sample data file is added below:
Using the above template and data file I want to create a report like this:
I have tried to... (1 Reply)
Hi,
I am splitting a file based on pattern using sed -f command as below:
sed_cmd2 is the Pattern filename which has the below mentioned pattern in it:
#n
/\(.*\) \(.*\) \(mith\).*/w smith
Input file has following data
1 John Smith Chicago
2 Mary Smith New York
3 Judy... (2 Replies)
vif =
I need to replace "00:16:3E:64:FB:D3" to a new mac address value from below mentioned file.
# cat vm.cfg
acpi = 1
apic = 1
builder = 'hvm'
device_model = '/usr/lib/xen/bin/qemu-dm'
disk =
kernel = '/usr/lib/xen/boot/hvmloader'
memory = '300'
name = 'vm_temp'
on_crash =... (1 Reply)
Hi I have a file that contains lines starting with a particular string plus a Colon: I need to output all these lines but only what comes after the colon
Can you pelase assist?
Example of lines in the file:
com.ubs.f35.cashequities/cashequities: 1 2
... (5 Replies)
Discussion started by: mnassiri
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)