Hi pros,
Could anyone tell me the actual difference between setting the positional parameters from the variable using the following commands?
$ var="This is my question"
$ set $var
$ echo $1 --> 'This'
$ echo $2 --> 'is'
....
....
and
$ var="This is my question"
$ set --... (3 Replies)
hi sirs
can u tell the difference between /var/log/syslogs and /var/adm/messages
in my working place i am having two servers.
in one servers messages file is empty and syslog file is going on increasing..
and in another servers message file is going on increasing but syslog file is... (2 Replies)
Hi there, In the following test, how to use shell var for pattern, regular expression. I need to accept pattern at argument, use it to pattern matching at shell script.
Test:
#!/bin/ksh
# name t.sh
exp="a@(a|b)"
touch aa ab ac
echo "\nTest without variable"
echo "---------------------"... (2 Replies)
Hello, I recently found that my /var/sadm/install/contents, ~/admin/default, /var/spool/patch and /var/spool/pkg files were empty.
This broke the pkginfo, pkgchk and other package related tools.
The pkgmap no longer points to where the applications have been installed.
I have replaced the... (0 Replies)
Hi Experts,
I'm having issue in assigning var with special character , please see below for complete details.
$ echo $SHELL
/bin/csh
$ cat bp
abd/asd/a
$ awk -F "/" '{print $NF}' bp | awk '{print $1}'
a
$ set a=`awk -F "/" '{print $NF}' bp | awk '{print $1}'`
$ echo $a ... (15 Replies)
Hi all,
Our users use Putty on Windows servers to log on to UNIX via SSH and run GUI applications. Is there a way to automatically get the display numbers from xming or Exceed (that are running on Windows) to set the DISPLAY var properly on UNIX? X11 forwarding is not an option.
The closest I... (3 Replies)
I have been searching and reading about syslog. I would like to know how to Transfer the logs being thrown into /var/log/messages into another file example /var/log/volumelog.
tail -f /var/log/messages
dblogger: msg_to_dbrow: no logtype using missing
dblogger: msg_to_dbrow_str: val ==... (2 Replies)
Discussion started by: kenshinhimura
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)