Hello Everybody,
I have files; yyyymmdd.log which the data look like this;
"Txid=9426043&MsgTxt=Thankyou&UserId=john&Password=jh2501"
"Txid=9426150&MsgTxt=Thankyou&UserId=john&Password=jh2501"
.
.
.
"Txid=9426200&MsgTxt=Thankyou&UserId=john&Password=jh2501"
Question 1:
How to... (3 Replies)
hello people,
All my servers have 4 mounts with this norme. For example, if my hostname is siroe.
df -h | grep `hostname`
/dev/dsk/c1t3d0s6 404G 399G 800M 100% /siroe3
/dev/dsk/c1t2d0s6 404G 399G 800M 100% /siroe2
/dev/md/dsk/d6 20G 812M 19G ... (3 Replies)
Instead of using the following command
#dmesg | grep -v sendmail | grep -v xntpd
How can I use just one grep -v and give both arguments.
Please suggest
thanks (4 Replies)
Hello,
Is there a way in grep to remember patterns?
For eg: int a,b,c,d,a;
If a variable is declared twice, like in the previous example, I should be able to print only those lines.
Is there a way to print only the lines where the variable name occurs more than once, using grep... (1 Reply)
i have files with "DOMAINSOLVER ACMS" with any number of spaces in between the two words on its own line and i can find it with the following:
grep -c "DOMAINSOLVER* ACMS" $FILENAMEbut i need to exclude any lines matching: "$DOMAINSOLVER". i've tried a variety of quoting and escaping with no luck.... (4 Replies)
is there anyway i can ask grep to only get the first line?
as in the top command line
line 1 <-- just grep this line
line 2
line 3
---------- Post updated at 04:24 PM ---------- Previous update was at 04:19 PM ----------
nvm.. found out that i can do it with
|head (12 Replies)
Hello all,
I'm trying to grep the string "scott" from all files whose names are like srvr*.log and that were created "Nov 15"...I'm trying the following command but throws an error message...seems like the syntax is incorrect..
grep scott < ls -l srvr*.log|grep "Nov 15"
Thanks for your... (9 Replies)
My grep returns a row of data like this:
75=20130130;60=074338;61=985;511=55473883;452=115439;62=196;267=1;
Is there a way for the grep to only return 60="something" and 511="something" ?
Thanks in advance. (10 Replies)
Discussion started by: Carl2013
10 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)