Hi.. when I do a ls -lt, I get a listing of about 200 files.. These are trace files and some of it I might not need..
To be clear, say in a given week , I might not need files that have been traced between 11 and 11:30 am on a particular day. How can I delete based on this condition ?
Thanks,... (4 Replies)
Guys help me out here....
I have the following var: date_system=20080507
And I have a folder with many files with the following pattern:
test_%date%_reference, like
test_20080201_tokyo.csv
test_20080306_ny.csv
and so on...
What I need is:
1) list all files and them compare the... (1 Reply)
Hi everyone,
I have some large text files that I need to split into a specific number of files of equal size. As far as I know (and I don't really know that much :)) the split command only lets you specify the number of lines or bytes. The files are all of a different size, so the number of... (4 Replies)
I have two files of the type
111 222 10
112 223 20
113 224 30
114 225 20
and
111 222 9
444 555 8
113 224 32
666 777 25
I want to merge files based on 1 and 2nd column. if 1st and 2nd column are unique in file 1 and 2 keep... (3 Replies)
I have two files as below
A file
/* comment for id1 */
"id1" = "x1"
/* comment for id2 */
"id2" = "x2"
/* comment for id3 */
"id3" = "x3"
B file
/* comment for id1 */
"id1" = "y1"
/* comment for id2 */
"id2" = "x2" (22 Replies)
Hi ,
I have 100 records in a.txt file
Need to split the a.txt file in to 5 files
1ST File:
ex: My file name should be a1.txt - line count in file should be 1 to 15
2ND File:
ex: My file name should be a2.txt - line count in file should be 16 to 40
3ND File:
ex: My file name... (1 Reply)
Hello,
I need to split a file by number of records and rename each split file with actual filename pre-pended with 3 digit split number.
What I have tried is the below command with 2 digit numeric value
split -l 3 -d abc.txt F (# Will Produce split Files as F00 F01 F02)
How to produce... (19 Replies)
Hello there.
I am trying to compare two files.
File1
Austria Mobile 1
United Kingdom Mobile 1
...
File2
Austria Mobile Vien 2
Austria Mobile Ostr 0
United Kingdom Mobile Dev 0.7
United Kingdom Mobile OST 1.5
What i want to do is to compare both files and... (12 Replies)
i use the split command to split a one terabyte backup file into 10 chunks of 100 GB each. The files are split one after the other. While the files is being split, I will like to scp the files one after the other as soon as the previous one completes, from server A to Server B. Then on server B ,... (2 Replies)
Discussion started by: malaika
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)