I am trying to reformat some UK postal codes. I have a csv where field 12 is the postal code. The postal codes length has a maximum of 7.
Basically, I would like a bit of code to look at field 12 and if the postal code has a length of 7, then insert a space into the field fourth from the right,... (3 Replies)
guys can anyone tel me how to insert a line in a file(bash) using line number
i wanna insert the line using LINE NUMBER...i know for inserting above or below a perticular line we can use sed a\ or i\....
thanks in advance.... (7 Replies)
I have a file where each line starts with a "update" statement. I want to insert a new line, after each line, with the words "go" in the new line. Can someone help me out with this? (1 Reply)
Hi
I would like to add lines to a file at specific locations.
eg: If I have a file containing data...
ABC
DEF
GHIJKLKMNOP
RSTUVWXYZ
and I have a requirement to insert a lines
a) "LINE_FIRST" before first line in the file
b) "LINE_X" before third line in the file
c) "LINE_LAST"... (2 Replies)
Hello,
I am new to this forum. I have a question in Unix shell scripting. Here is my requirement
I have 1000 files and I need to insert a header with one line at the top of
each of the 1000 files. Please let me know if you have any solution for this
Thanks in advance.
Raj (4 Replies)
Hi Guys ,
I Need to insert records into a file just above the last row .
like i have a file which has records as shown below :
00012919 7836049 S
00012920 7836049 S
00012921 3828157 Y
00012922 3828157 Y
00012923 3828157 S
T005290070331000012923
i want to... (1 Reply)
Hi Team,
I am trying to get the data in below format
Jan 01 | 19:00:32 | xyz | abc | sometext | string
however I am not sure of the total number strings which can come in the record hence i cant use something like below as it can end $6 or it can go further
cat file| awk... (8 Replies)
I have a list of more than 1000 files on the following format.
roman_pottery_in_the_archaeological_record_2007.pdf
power_politics_and_religion_in_timurid_iran_2007.pdf
toward_a_theory_of_human_rights_religion_law_courts_2006.pdf
i_was_wrong_the_meanings_of_apologies_2008.pdf
I want to... (2 Replies)
Hi all,
I want ot print a header with new line in the end. I am using echo
like echo "this is header"
I want output like
This is header
$
I tried -e also but it's not working. echo - e
Can anyone help please? (6 Replies)
Discussion started by: dsa
6 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)