04-16-2012
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I have a huge file & I want to add a specific text in column. But I want to add this text from a specific line number to a specific line number & another text in to another range of line numbers.
To be more specific: lets say my file has 1000 lines & 4 Columns. I want to add text "Hello"... (2 Replies)
Discussion started by: Ezy
2 Replies
2. Shell Programming and Scripting
Hi
I want to extract certain text between two line numbers like
23234234324 and
54446655567567
How do I do this with a simple sed or awk command?
Thank you.
---------- Post updated at 06:16 PM ---------- Previous update was at 05:55 PM ----------
found it:
sed -n '#1,#2p'... (1 Reply)
Discussion started by: return_user
1 Replies
3. Shell Programming and Scripting
using sed to replace a specific string on a specific line number using variables
this is where i am at
grep -v WARNING output | grep -v spawn | grep -v Passphrase | grep -v Authentication | grep -v '/sbin/tfadmin netguard -C'| grep -v 'NETWORK>' >> output.clean
grep -n Destination... (2 Replies)
Discussion started by: todd.cutting
2 Replies
4. Shell Programming and Scripting
Hi guys ,
I m writing a script to delete a line at particular location.
But i m unable to use variable for specifying line number.
for example.
sed -n '7!p' filename
works fine and deletes 7th line from my file
but
sed -n '$variable!p' filename
gives following error.
sed: -e... (12 Replies)
Discussion started by: pinga123
12 Replies
5. Linux
Hello! All,
Could you please tell me how to get a specific line number from a text file?
For example below,
ABC
DEF ---> Get this line number, return to an variable
GHI
My OS is Linux.
Thank you so much for your help in advance! (3 Replies)
Discussion started by: barryxian
3 Replies
6. Shell Programming and Scripting
I have list of files in a directory 'dir'. Each file is of type HTML. I need to read each file and get the string which starts with 'http' and write them in a new text file. How can i do this shell scripting?
file1.html
<head>
<url>http://www.google.com</url>
</head>
file2.html
<head>... (6 Replies)
Discussion started by: vel4ever
6 Replies
7. Shell Programming and Scripting
Hello everyone,
I don't really know anything about scripting, but I have to manage to make this script, out of necessity.
#!/bin/bash
while read -r line; do #I'm reading from a big wordlist
instructions using $line
done
Is there a way to automatically write the $line number the script... (4 Replies)
Discussion started by: bobylapointe
4 Replies
8. Shell Programming and Scripting
Hi All,
I've a file like this..
Sheet1
a,1
a,2
a,3
a,4
a,5
Sheet2
a,6
a,7
a,8
a,9
a,10
Sheet3
a,11
a,12
a,13 (7 Replies)
Discussion started by: manab86
7 Replies
9. Shell Programming and Scripting
my requirement is,
consider a file output
cat output
blah sdjfhjkd jsdfhjksdh
sdfs 23423 sdfsdf sdf"sdfsdf"sdfsdf"""""dsf
hellow there
this doesnt look good
et cetc etc
etcetera
i want to replace a line of line number 4 ("this doesnt look good") with some other line
... (3 Replies)
Discussion started by: vivek d r
3 Replies
10. Shell Programming and Scripting
Hi guys,
I am running a while loop in a script ro read a file line by line.
Now I want to run a grep only on the lines below the line I am that is being read by the while loop.
Eg:
If my while loop is on line 4 of the file, the grep only runs below line 4 and does not include line 1,2... (3 Replies)
Discussion started by: Junaid Subhani
3 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)