I have a small query. I have a file containing the following lines
abcd<12></12>fdfgdf<12>sdfgfg<12>
sdfsdf<12></12>ytunfg<12>
hggfhf<12>rtysb<12>zdfgdfg<12>
Now I wish to delete ONLY the last occurance of string <12> from every lines of code. That mease my final output will be like this:... (7 Replies)
I need help to strip out the first two characters of the variable $FileName. Please help.
FileName=`find . -mtime +0 -name '*'`
Contents of variable $FileName:
./SRIZVI4.MCR_IDEAS_REPORT.LAST.052705.075405.csv
I want to strip out "./" and place the contents in another variable. How do I... (3 Replies)
Hi. I want to remove a substring from a string. If I use the "tr" command, it doesn't seem to to what I want it to:
echo './somestring.dat' | tr -d './'
results in
somestringdat
I want it to remove only occurances of the string './', rather than the individual character. The result... (1 Reply)
While writing a shell script i happen to store some value in a string. Lets say the value is 59788.
Now in this script i want to get the value 9788 removing the first charater 5. The original string length usually remains constant.
Is there a single line command to do this or any simple way to... (4 Replies)
I want a user to be able to paste in a string like "01 3F 20 1F" and have the script reformat it to "013F201F" to pass it on to the next step.
I was trying to figure it out with awk but wasnt working well.
Never mind, found answer. did not know about tr :) (7 Replies)
Hi ,
I have a file with the following contents in file test1.txt .
AMY_MTT_240Y001,N60_PG2_10G001,A2H_P3H_10G002,7C7_7D7_NP1,A2E_PV0_10G002,L78_PG1_64S001,A2H_P2M_NP2,LDN_YSN_64S001,WV6_WYV_64... (5 Replies)
I'm writing a UNIX script to interpret text files and search for certain strings to output and need to delete certain lines that contain characters that I would like removed from the file. The rest of the script is already completed and I have it output how I would like, but I cannot seem to get... (2 Replies)
Hello everyone,
I want to remove only prefix ME_ from all the values that are present in the FILEA. Below code I'm using for this.
sed 's/ME\_//g' FILEA > FILEB
Using the above code, all ME_ values are getting removed from the file. But the problem here is I want to remove only Prefix ME_... (4 Replies)
What I need is to remove the text from Location_file.txt from each line matching all entries from Remove_location.txt
Location_file.txt
FlowPrePaid, h3nmg1cm2,Jamaica_MTAImageFileFlowPrePaid,h0nmg1cm1, Flow_BeatTest,FlowRockTest
FlowNewTest,FlowNewTest,h0nmg1cm1
PartiallySubscribed,... (3 Replies)
Discussion started by: ketanraut
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)