I have a rather long csh script that works, but it's terribly ungraceful and takes a while from various loops. I only know enough code to get myself into trouble, so I'm looking for some guidance.
I have a large file that is separated at intervals by the same line, like this:
... (2 Replies)
Hi all,
I have this doubt as to whether we can selective mount FS .by taking the input from the vfstab?
ie, suppose i want to mount tmpfs(actually i want to do it :))but i dont want to follow the conventional way through the script that actually does!!
However i want to just collect that... (0 Replies)
Dear users,
I am new to AWK and have been battling with this one for close to a week now. Some of you did offer some help last week but I think I may not have explained myself very well. So I am trying again.
I have a dataset that has the following format where the datasets repeat every... (5 Replies)
I have a file that is HTML encoded. Each line has something like this on each line..
<href=http://link.com/username.aspx>username </a> more info.. <a href=http://link.com/info1.aspx>info1</a> more code... <a href=http://link.com/info2.aspx>info2</a>
I have one goal really.. to clean up the... (2 Replies)
The following perl statement in a bash script consists of two substatements. I intend the first perl substatement (the assignment with glob) to get input from the preceding bash pipe, and the second perl substatement (the foreach loop) to output back to bash. However, the first perl substatement... (7 Replies)
The only way I know of is manually as follows:
To remove for example ^M from a file:
- vi the file name that has ^M at the end of each line.
- Hit <Esc>
- Type :g/
- Hold the CNTRL key and press V and M then release the CNTRL key At the buttom you should see this by now: ... (3 Replies)
Dear All
I have a text file which has many columns (>10,000). I want to create a new text file which will NOT include following columns: 5,15,105,200. How can I do that in shell (or awk, perl)? Thanks. (6 Replies)
Hi i have a file in which i am doing some processing.
The code is as follows:
#!/bin/ksh
grep DATA File1.txt >> File2.txt
sed 's/DATA//' File2.txt | tr -d ‘ ‘ >> File4.xls
As you can see my output is going in a xl file.The output consist of four columns/feilds out of which the first... (20 Replies)
I have a file that look like this:
>Muestra-1
agctgcgagctgcgaccc
gggttatata
ggaagagacacacacaccccc
>Muestra-2
agctgcg
agctgcgacccgggttatataggaagagac
acacacaccccc
>Muestra-3
agctgcgagctgcgaccc
gggttatata
ggaagagacacacacaccccc
I use the following sed script to remove newlines from... (2 Replies)
Discussion started by: Xterra
2 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)