I have a file which has some lines starting with a particular word. I would like to delete 5 lines before each such line containing that particular word.
eg:
line1
line2
line3
line4
line5
line6
"particular word"...
I would like to delete line2-line6 and all such occurences in that... (4 Replies)
Hi,
I'am working under unix solaris
I have a text file with set of lines, each set of lines (BLOCK) have
three fixed lines :
Between SECND line and THEND we have N lines, N differ from a block to another
sample :
i have to make a script wich delete each 3 fixed lines if N=0... (3 Replies)
I want to delete all lines from a file (orig_file) that contain the regex values (bad_inv_list)
I tried a for each loop with sed but it isn't working
for file in `cat bad_inv_list`;
do
sed '/$file/d' orig_file > pared_down_file.1
mv pared_down_file.1 orig_file
done
I've added... (2 Replies)
Hello,
I have a file filled with dates, such as:
04-08-2011 message
04-08-2011 message
03-08-2011 message
01-08-2011 message
31-07-2011 message
24-07-2011 message
15-07-2011 message
13-12-2008 message
26-11-2007 message
And I want to delete those lines whose date is older than 10... (5 Replies)
I have a big file having 100 K lines.
I have to read each line and see at 356 character position whethere there is a word "W" in it. If it is their then don't delete the line otherwise delete it.
There are two lines as one Header and one trailer which should remain same.
Can somebody... (5 Replies)
Hi,
I have a file with 20 columns of data and hundreds of lines of the same format.
Here is an example line. The data repeats underneath with the same format.
15 1 4 GLY - 1 65 LYSH 23 N - 24 H - 634 O 0.188 157.552 487 48.70I have been sorting this data by hand but I was wondering if I... (3 Replies)
I'm trying to create a script.
There are 2 files - fileA.log & fileB.log
fileA.log has the below data :
aaaa
cccc
eeee
fileB.log has the below data :
cjahdskjah aaaa xyz
jhaskjdhas bbbb abc
ajdhjkh cccc abc
cjahdskjah ... (7 Replies)
Hi,
I'm trying to search for some number and from that line, i need to delete the 5th line exactly.
Eg:
Consider below as text file data:
10000
a
b
c
d
e
.
.
.
10000
w
q
t (8 Replies)
Discussion started by: Gautham
8 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)