10 More Discussions You Might Find Interesting
1. Solaris
Hi,
on sunfire v890 unable to move from rsc prompt to ok prompt, i have executed the command break. (9 Replies)
Discussion started by: manoj.solaris
9 Replies
2. UNIX for Dummies Questions & Answers
how to Change the % prompt to - prompt in unix
:wall:
---------- Post updated at 07:40 AM ---------- Previous update was at 07:38 AM ----------
How To display the last modification time of any file in unix
---------- Post updated at 07:40 AM ---------- Previous update was at 07:40 AM... (2 Replies)
Discussion started by: manjiri sawant
2 Replies
3. Shell Programming and Scripting
Hi,
I've a problem regarding understanding of result of passwd -s command.
> passwd -s
abc PS 05/24/12 0 441
I'm not a super user. But i need to write a simple code for checking password expiry and send an email to the team id. Is there any other command or way to achieve this?... (6 Replies)
Discussion started by: sam_bd
6 Replies
4. AIX
Does anyone know when AIX started using /etc/security/passwd instead of /etc/passwd to store encrypted passwords? (1 Reply)
Discussion started by: Anne Neville
1 Replies
5. Solaris
Hi Folks,
I have Solaris 10, latest release.
We have passwd aging set in /etc/defalut/passwd.
I have an account that passwd should never expire. Acheived by emptying associated users shadow file entries for passwd aging.
When I reset the users passwd using passwd command, it re enables... (3 Replies)
Discussion started by: BG_JrAdmin
3 Replies
6. Shell Programming and Scripting
I have left unix for a long time.Almost forget everthing.:(
Anybody can tell me what is the meaning?
wc /etc/passwd
9 16 1155 /etc/passwd
and
$ wc -l /etc/passwd
wc -l /etc/passwd
9 /etc/passwd (1 Reply)
Discussion started by: zhshqzyc
1 Replies
7. HP-UX
Dear frnds,
I have 250 users in passwd file with different passwords, how i can change the password to username+99. pls help out.
regards (6 Replies)
Discussion started by: jestinabel
6 Replies
8. UNIX for Dummies Questions & Answers
Can anyone explain the second and third fields in /etc/passwd.
Thanks. (2 Replies)
Discussion started by: nguda
2 Replies
9. UNIX for Dummies Questions & Answers
hello,
I don't why I can't change the password, when ever I try to run passwd I get the problem??!!!
unixws1:ldb> passwd
passwd: Changing password for ldb
Permission denied
regards,
me (2 Replies)
Discussion started by: geoquest
2 Replies
10. UNIX for Advanced & Expert Users
I have to change more then 200 User at once
the password (security-dday).
The programm passwd will answers (new password + again)
How can i do this in a script?
thanks for answers (5 Replies)
Discussion started by: Erwin Stocker
5 Replies
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)