Dear All,
I have the followoing requirement..
REQ-1:
Suppose I have the following files
XX_20070202000101.zip
XX_20080223000101.zip
XX_20080226000101.zip
XX_20080227000101.zip
XX_20080228000101.zip
XX_20080229000101.zip
Suppose sysdate = 29 Feb 2007
I need to delete all files... (3 Replies)
Hi,
With the help of below script im able to get the count of all the .xml files but that count is not specific to a day ie its the total count of all .xml files what i want is specific to 1 day and that of every half an hr ie from 23 feb 2009 7 am till 23rd feb 2009 2300 am and from 07:00 to... (1 Reply)
I have a few log files which get generated on a daily basis..So, I need to pick only the ones which get generated for that particular day.
-rw-r--r-- 1 staff 510732676 Apr 7 22:01 test.log040711
-rwxrwxrwx 1 staff 2147482545 Apr 7 21:30 test.log.2
-rwxrwxrwx 1 staff 2147482581 Apr 7 19:26... (43 Replies)
Hi Friends,
Newbie to shell scripting. Currently i have used the below to sort data based on filenames and datestamp
$ printf '%s\n' *.dat* | sort -t. -k3,4
filename_1.dat.20120430.Z
filename_2.dat.20120430.Z
filename_3.dat.20120430.Z
filename_1.dat.20120501.Z
filename_2.dat.20120501.Z... (1 Reply)
Hi,
I have requirement to list out files that are created after particular file.
ex. I have below files in my directory. I want to display files created after /dirdat/CG1/cg004440 file.
./dirdat/CG1/cg004438 09/07/14 0:44:05
./dirdat/CG1/cg004439 09/07/14 6:01:48 ... (3 Replies)
Hi ,
I did the initial search but could not find what I was expecting for.
15606Always_9999999997_20160418.xml
15606Always_9999999998_20160418.xml
15606Always_9999999999_20160418.xml
9819Always_99999999900_20160418.xml
9819Always_99999999911_20160418.xmlAbove is the list of files I... (4 Replies)
Hi,
I have two pipe separated files as below:
head -3 file1.txt
"HD"|"Nov 11 2016 4:08AM"|"0000000018"
"DT"|"240350264"|"56432"
"DT"|"240350264"|"56432"
head -3 file2.txt
"HD"|"Nov 15 2016 2:18AM"|"0000000019"
"DT"|"240350264"|"56432"
"DT"|"240350264"|"56432"
I want to list the... (6 Replies)
Hi All,
I have list of files like below with name abcxyz.timestamp. I need a unix command to pick the latest file from the list of below files. Here in this case the lates file is abcxyz.20190304103200. I have used this unix command "ls abcxyz*|tail -1" but i heard that it is not the appropriate... (2 Replies)
Discussion started by: rakeshp
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)