import itertools
paralog = ['a','b','c','d']
for L in range(2, len(paralog)-1):
for subset in itertools.combinations(paralog, L):
print(subset)
It just give me one group, and I have more than one thousand groups.
Run as python combination.py nengcheng.file
Code:
import fileinput
import itertools
for line in fileinput.input():
fields = line.split()
for L in range(2, len(fields)-1):
for subset in itertools.combinations(fields, L):
print ' '.join(subset)
Hello All,
i have two files, one of the format
A 123
B 124
C 234
D 345
And the other
A 678
B 789
C 689
D 567
I would like to combine them into one file with three columns:
A 123 678
B 124 789
C 234 689 (4 Replies)
File_A contains Strings:
a
b
c
d
File_B contains Strings:
a
c
z
Need to have script written in either sh or ksh. Derive resultant files (File_New_A and File_New_B) from lists File_A and File_B where string elements in File_New_A and File_New_B are listed below.
Resultant... (7 Replies)
Hi,
I am trying to define number of array based on constant derived during execution phase of a script. Here is what i am trying..
#First Part, Get LUN input from User
lun_count=4
count=0
set -A my_lun
while :
do
while ]; do
read L?"Enter Lun "$count" Number:"
... (2 Replies)
Dear All,
I'm working as a DBA and dont have much knowledge at OS level commands.we have requirement that we need find the files which has been last accessed >= apr 2010and also access date <= apr 2010 for a large set of files.Do know some commands likeistat, ls -u.But can anyone provide me the... (4 Replies)
Is there a way to tell diff to show differences one line at a time and not to group them? For example, I have two files:
file1:
line 1
line 2
line 3 diff
line 4 diff
line 5 diff
line 6
line 7
file2:
line 1
line 2
line 3 diff.
line 4 diff.
line 5 diff.
line 6
line 7 (13 Replies)
Hi Experts,
I am having a requirement, where i need to generate a report of the execution time of all the processes. All the processes generate the log files in a log directory and I can get the execution time from the log files. like below is the log file.
/home/vikas/log >ls -l... (2 Replies)
Hi,
I have an input file like this
a
b
c
d
I want to print all possible combinations between these records in the following way
aVSb
aVSc
aVSd
bVSc
bVSd
cVSd
VS indicates versus. All thoughts are appreciated. (5 Replies)
I have this while loop, that works but is quite slow to process though. I'm hopping there might be a faster/better way to find what I'm looking for.
I have 2 lists of numbers, and want to only find files where a file name has both values present.
each list has about 100 values.
while... (10 Replies)
Discussion started by: whegra
10 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)