Hi Friends
I have a file
like
sample1.txt
------------
10998909.txt
10898990.txt
1898772222.txt
8980000000000.txt
I need to take first 3 characters of each line in a file and i need to print it '
like loop
109
108
189
898 (7 Replies)
I know this sounds simple, but I have a logfile with
> something
> something_else
> another_entry
...
how do I cut the first 2 characters off the left side? I tried to use
cut -c 1-2 somefile > someotherfile
but that just cut gave me the 2 left characters, I want to cut those out... (2 Replies)
Hi All,
Need to convert file names to upper case using tr command in Unix.
In a folder -> /apps/dd01/misc
there are two files like:
pi-abcd567sd.pdf
pi-efgh1.pdf
The output of should be like:
pi-ABCD567SD.pdf
pi-EFGH1.pdf
I have used the command to work as below:
for f... (3 Replies)
Guys,
can you help me in doing cut first 21 and 32-35 characters from file.
I tried with cut -c to cut first 21 characters ,It is succeeded.
But i need both first 21 and 32-35. (1 Reply)
hello everybody
i am looking for a shell to cut a flat file (with a long unique line) according to a certain number of characters and redirect every result to an output file.
here is an example
MyFile :
12 3 456 12 3 456 12 3 456 .....
and i took every 9-characters including BLANKS... (6 Replies)
Hi,
I would like to cut last 13 characters of a file name and take the rename the file name as follows:
Input:
A.DAT20110517033732
Output:
A.DAT
I have tried the following command and cut last 13 characters.
echo A.DAT20110517033732 | awk '{print substr($0, length($0)-13)}'
... (3 Replies)
Hi,
I am working on one script..I am having files in the below format
file 1 (each line is separated with : delimeter)
SPLASH:SPLASH:SVN
CIB/MCH:MCH:SVN
Now I want from file 1 that most left part of the first line will store in... (6 Replies)
Hello all,
I have a file and would like to cut the first 100 characters of the first line. I tried it with the ‘cut’-command:
cut –c100- $file > $file.tmp
But this does not work, because it will cut the first 100 characters of each line. But I need to cut them only from the beginning of... (6 Replies)
Discussion started by: API
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)
10-22-2011
cut certain characters for each line in a file
