dear all,
can anyone help me to explain all the commands in the .profile bourne shell below ? really appreciate ur help. PLEASE.
1
2 # @(#) $Revision: 72.2 $
3
4 # Default user .profile file (/usr/bin/sh initialization).
5
6 # Set up the terminal:
7 if
8 then
9 eval ` tset -s -Q -m... (1 Reply)
currentSid=${TWO_TASK:-$ORACLE_SID}
echo $currentSid
this script returns value of ORACLE_SID but what i am not getting is
what is ":-" doing ?? (1 Reply)
See topic.
I need to understand how it works before i start to work on a program anyone have any resources or the time to explain it thanks. (5 Replies)
Dear Member,
i need help in this script
filename_DD_MM_YYYY_HHMMSS.log
this is the log file format
i need to split this name to three variables
1 variables contain filename
2 variables contain _DD_MM_YYY_
3 variables contains HHMMSS
... (7 Replies)
Hi frnds,
one my frnds has given resolution for my problem as below. it working great , but i couldnt understand somethings in the script.
Why ++ operator after the function calling. how these each block working. will each run for each input line sequencially or one block for all the lines... (9 Replies)
I am trying to figure out what this script does. Can someone help?
delt_file=`diff /transfer/adx/tey_header.txt /transfer/adx/tey_header_yesterdy.txt`
if ] ; then
touch /transfer/adx/lrstb028_ctl2.ctl
else
if test -f "/transfer/adx/lrstb028_ctl2_2.ctl" ; then
touch... (1 Reply)
Hi i am new to shell script can any one please explain me the code below which is written for execution of python scripts which are located in same folder.
please explain the code line by line
ls *.py > xx
while
do
read myline || break
python $myline
done<xx
Thanks
Mukthyar.... (1 Reply)
think using shift would help me finish my script but cant get it work without your help. would appreciate if you give me a example with shift & counter in the same script so I can later work on that to my one.
Thanks and Good Luck! (1 Reply)
Discussion started by: me.
1 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)