I'm trying to compile and install both most recent version of 'make' and the
most recent version of 'openssh' on my Sparc20.
I've run into the following problems... and I don't know what they mean. Can
someone please help me resolve these issues?
I'm using the 'make' version that was... (5 Replies)
Hi
how can i do this?
1) shell script which writes data and time on to a file if filesystem exceeds 70% of space.
2) make entry to cron table to run a script every 15 mins.
and can anyone expplain or demonstrate the difference between variables used in inside a function and outside a... (3 Replies)
Hi,
I,ve a Unixware 7.1.3 working correctly for two years ago, since a several weeks I've a problem with the command last . The information that this command return is :
For example :
1.- The user root , time login : 12:15 h, time logoff 12:15 h (the real time is 14:00). Connected time is... (3 Replies)
I'm having problems uses "if"
it works fine when i do this.
#!/bin/sh
a= 10
qw= 2
w= 20
{
if && ;then
echo 3
fi
}
However if i try to do
#!/bin/sh
a= 10 (5 Replies)
Hello,
I am having problems with using less on
Linux version 2.6.18-92.1.17.el5 (brewbuilder@hs20-bc1-7.build.redhat.com) (gcc version 4.1.2 20071124 (Red Hat 4.1.2-42)). I am using csh but have the same problems on bash.
If I pipe something to less it works perfectly i.e. cat file | less... (9 Replies)
good friends I am new to linux and I have the following
TELNET service problem entering data devo
telnet to a Windows server 2003 server and passes
will not let me since the move to this server by
telnet tells me the characters and thus invalidates me
income, I have a service application... (1 Reply)
I have written the following code in cygwin to create directories in windows based on the parameter passed.
echo $1 > fullpath
path1=`awk -F / '{print $1}' $fullpath
path2=`awk -F / '{print $2}' $fullpath
if
then
if
then
if
then
continue
... (4 Replies)
#! /bin/bash
# ask what the user would like to do
CMD=$CMD
MBA=$MB
RS=$RS
CT=$CT
echo
echo -n "What would you like to do??
REMEMBER WHEN PROGRAMMING ICP's TO SELECT CORRECT COMMAND ACCORDING TO
NECCESSARY TYPE CODE!
Please enter a command
ct = program ctek
... (5 Replies)
I'm new in Shell Programming and Scripting, I would like to ask some questions.
ps -ef | grep $appNAme | grep -v grep <-- what will it return when it find a process is running? return 1 or 0
if
then
exit 1 <--- if = 0 , run this ?
else
continue <--- if = 1 , run this ?... (5 Replies)
Discussion started by: LoAlex
5 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)