Tip1:
If you want this portable to Unix systems, stick to Posix.
The "Man Pages" at the top of the unix.com pages guide you to the Posix man page for ps.
Also the ksh/zsh-only print was replaced by the portable printf.
Tip 2:
If you do not want a header line then use ps -e -o pid= -o user= -o args=.
I've noticed most of my postings here are because of syntax errors.
So I want to begin compiling a large txt file that contains all the "man <cmd>" of the commands I most have problems with. I ran a "man nawk >> nawk.txt" but it included a header/footer on each "page". Anyone know how I'd be... (6 Replies)
write the sed command for swapping the first and 2nd (fields)words in the following file
input file
cse1 rama 1223
cse2 raju 2453
cse3 sita 3523
i tried with this
$sed 's/ \(*\)/ \(*\)/ \2,\1' myfile1
but not getting th required... (4 Replies)
Hi,
I am using SunOS
I want to serch my previous command
from unix prompt
(like on AIX we can search by ESC -k)
how to get in SunOs
urgent help require. (10 Replies)
Is there any command to know ,how many files are deleted when rm *. cmd was excuted.
I worte script which runs for 1 hours regularly and it is used to delete the .exe files but i need to know how many exe files are deleted regularly.
Please let me know the cmd
---------- Post updated at... (3 Replies)
Hello,
There's a third-party application's command that shows the application's status like "tail -f verybusy.log". When use the command, the output comes every 1-sec. but when it goes in a script below the output comes every 8-sec...What is the problem and how can I fix it?
open(CMD,... (2 Replies)
Hello,
I'm having a trouble with the find cmd.
I would like to find all the java versions on my systems.
I have solaris 9 & 10 RHEL and SUSIE.
java -version
doesn't give all the versions on the server.
So I am trying to use the find command to find them all
find / -name java
I would... (7 Replies)
What is the cmd line to connect sftp, specifing the port number and the shh key file.
When I use the below cmd format, it gives the msg :node name or service name not known, but I know the connection works, because the automated sftp script works fine and I can log into the remote server
... (3 Replies)
Discussion started by: ITDev01
3 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)