Hi,
In my korn shell script, I want to delete some particular text from a certain file...How can this be done? Is the below right?
ed $NAMES << EOF
echo "" > /dev/null
echo "${x} = " > /dev/null
echo "name = " > /dev/null
echo "adress = " > /dev/null
w
q
EOF (1 Reply)
Need to delete a text block inside a file, that is marked with a start and an end pattern. Eg
do not delete
not delete
<tag1>
delete everything here
here
and here
and here...
<tag2>
do not delete
do not delete....
Believe sed is able to do this job but don't get it working.
... (1 Reply)
Hi everyone,
I have text files that I want to delete lines from. I have searched through this forum for quite some time and found examples of both awk and sed. Unfortunately, I was not able to successfully do what I want. Well to some extent. I did manage to delete the first 15 lines from each... (5 Replies)
Say I have a file with a bunch of config blocks (see below) in a file. If I send a variable to the function, how can I remove that block of text?
define host{
host abc
description testserver
}
define host{
host xzy
description prodserver
}
So in the example... (3 Replies)
In my command prompt I did:
sed 's/\://' mytextfile > newtextfile
But it only deleted the first instance of : in each line when some lines have multiple : appearing in each one. How can I delete all the : from the entire file? (1 Reply)
I have a text file that looks like this:
I want to delete the last character of first column in all rows so that my output looks like this:
Thanks a lot! (1 Reply)
I know this is a complicated question but I will try to illustrate it with some data. I have a data file that looks like the following:
1341 NA06985 0 0 2 46.6432798439
1341 NA06991 NA06993 NA06985 2 48.8478948517
1341 NA06993 0 0 1 45.8022601455
1340 NA06994 0 0 1 48.780669145
1340... (1 Reply)
Hi all,
I have a fat file which contains something like this:
************************************************
blahblahblah
blahblahblah
Myobject1 HOME (
homecontents01 (
some junk;
)
home contents02(
some junk;
)
... (7 Replies)
Hello,
I have a list of words separated by spaces I am trying to delete from a text file, and I could not figure out what is the best way to do this.
what I tried (does not work) :
delete="password key number verify"
arr=($delete)
for i in arr
{
sed "s/\<${arr}\>]*//g" in.txt
}
>... (5 Replies)
Discussion started by: Hawk4520
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)