10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I'm on Ubuntu 14.04 and I manually updated my coreutils so that "tee" is now on version 8.27
I was running a script using bash where there is some write to pipe error at some point causing the tee command to exit abruptly while the script continues to run. The newer version of tee seems to prevent... (2 Replies)
Discussion started by: stompadon
2 Replies
2. Shell Programming and Scripting
i try to find way to make string concatenation in csh ( sorry this is what i have )
so i found out i can't do :
set string_buff = ""
foreach line("`cat $source_dir/$f`")
$string_buff = string_buff $line
end
how can i do string concatenation? (1 Reply)
Discussion started by: umen
1 Replies
3. Shell Programming and Scripting
08:29 < xsi> >{respo,nd}.php bash: {respo,nd}.php: ambiguous redirect
08:31 < geirha> xsi: maybe you want tee
So I was advised to do so. And I can't create two OR MORE files at once with {a,b,c,d,e,f}.php
(which I quickly now need to create and to learn to create in the future to quickly... (2 Replies)
Discussion started by: Xcislav
2 Replies
4. Shell Programming and Scripting
dear all
suppose I have two files file_000 and file_id:
file_000:
blablablabla000blablabla000
000blahblah000blahblah
blah000blahblahfile_id:
001
002
003now, based on file_id, I want to create 3 files; the name of each file would be file_001,file_002,file_003,respectively, and the... (4 Replies)
Discussion started by: littlewenwen
4 Replies
5. Shell Programming and Scripting
Dear All,
I am trying to write a Unix Script which fires a sql query. The output of the sql query gives multiple rows. Each row should be saved in a separate Unix File.
The number of rows of sql output can be variable. I am able save all the rows in one file but in separate files.
Any... (14 Replies)
Discussion started by: Rahul_Bhasin
14 Replies
6. Shell Programming and Scripting
HI,
I would like to create the files as
file1.txt
file2.txt
file3.txt
......
.......
.......
filen.txt
in a single unix command, i dont want to use the loops.
n is user specific
Kindly help me in this.
THank you
Jagadeesh (2 Replies)
Discussion started by: jagguvarma
2 Replies
7. Solaris
Hi,
Is the contents in /var/log/syslog and /var/adm/messages are same??
Regards (3 Replies)
Discussion started by: vks47
3 Replies
8. Shell Programming and Scripting
why I cannot do this?
prog_name | tee logfile | awk /regexp/ | awk /regexp/ I now this is not elegant code, but am intrigued as to why multiple pipes from tee not allowed. (2 Replies)
Discussion started by: euval
2 Replies
9. Red Hat
Hi All,
How do I create /var as LVM type during install? I want my new OS to have /var as LVM so that I could extend it on the fly.
Thanks for any comment you may add. (2 Replies)
Discussion started by: itik
2 Replies
10. Solaris
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)
Discussion started by: tv.praveenkumar
2 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)