Hello people.
I need some help to do this:
I've got some files that i need to count the caracters of filenames.
20080209_2000591574_237004076372.xml
20080202_1360584_267002636042.xml
The minimum is 15 . If some file with less must move them to another directory.
Obviously these... (3 Replies)
Hi what is the purpose of using underscore in awk. I suppose it is for defining macro's and reducing repeatation but can some one show me an example? (6 Replies)
Hi
I have the following files in a directory -
ds_pl_W_Test
ds_pl_list_Test
ds_pl_list_Test
ds_pl_listl_Test
ds_pl_file_Test
ds_pl_xx_Test
I would like to count the number files in the directory that contain the word "list"
I tried the following but it returns zero -
... (3 Replies)
How does adding an underscore change a google search? I was searching for John Elway and got different results with and without an unscore. (3 Replies)
Hi Everyone,
I am looking for a command that would do the following:
1) Change all the letters/words in a file to Lower case Letters/words.
2) Remove the Underscore (_) and Change the Character after the underscore (_) to an Uppercase letter.
Example:
File contains the below words:
... (5 Replies)
Hello,
I do have folders containing having funny strings in their names and one space.
First, I do remove the funny strings and replace the space by an underscore.
find . -name '* *' | while read file;
do
target=`echo "$file" | sed 's/... (2 Replies)
Hello,
I have spent a couple of hours trying to answer this myself, so forgive me if the answer is simple but I have tried.
I have a text file generated from svn log output which contains a list of files.
Two regexps im using are
*
and
*
They both work but some lines has a mixture... (7 Replies)
Hi I have a set of files in one directory like below
FIN_TASK1.csv
FINA_TASK2.csv
FIN_TASK3.csv.
I want a command to print the count in each file and the correspong file name into one file.My expected output is given below
cat filcount.txt
2 "FIN_TASK1.csv"
4 "FIN_TASK2.csv"
... (3 Replies)
Discussion started by: ginrkf
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)