Hi,
I have a file with multiple records...and I have to select records based on first column....here is the sample file...
I01,abc,125,1a2,LBVI02
I01,abc,126,2b5,LBVI02
I02,20070530,254,abc,LLBI01
I02,20070820,111,bvd,NGBI01
I need all records with I01 in first field in one file and... (8 Replies)
I've a file like this:
andrea andre@lol.com october
antonio@lol.com
marco 45247@pop.com
kk@pop.com may
pollo@lol.com
mary mary@lol.com
can I select only the column with email adress?
can I utilise a filter with @ ?
I want obtain this:
... (2 Replies)
Hi,
Following is my file output
247 Sleep 25439 NULL
259 Sleep 25460 NULL
277 Sleep 15274 NULL
361 Sleep 2 NULL
362 Sleep 202 NULL
I want to select only first column to other file
How can... (2 Replies)
How can I use awk to pick a particular column and work on it? For example, I want to count the number of characters in column10 that are separated by |?
Thank you. (2 Replies)
I know I know..
for sure one of the easier mysql statements. But somehow I can not figure out this.
I expect to see all distinct items of 'data_12' where 'kwroot' has 'straxx' in, and in the same row 'data_12' ist (not = 'kwsearched' in any existing row)
data_12 ... (6 Replies)
Two columns are there in a table Value and Value2.I need to select a desired value from 'value' column if the Value2 is having a particular value.
Ex. Table has values
----------------------------
Value Value2
----------------------------
1 GOD
... (6 Replies)
Hi!
From a file the format of whichis as in the sample here below, I need to get two files having just 2 columns, being - for the first file - the 2nd than the 1st from the original file; and - for the second file - the LAST then the 1st column of the original file.
Moreover, I would sort the... (3 Replies)
Hi all,
Am using awk to reformat an existing file
cat $INP_FILE1 | while read line
do
echo "$line" | nawk ' BEGIN {FS=","} {print("5",$1,$28,"$27",$26)}' >> $OUT_FILE1
done
my question is, i would like to read lines that are starting with particular value only example
... (9 Replies)
I want records which have more than one and different value in the second column on the below sample file.
Ex, I have the samle file below :-
XYZ 1
XYZ 3
abc 1
abc 1
qwe 2
qwe 1
qwe 3
I want to select XYZ and QWE line only. (6 Replies)
Hi all,
Am trying to write a menu driven script using SELECT and if I have more than 4 options, it wraps to the next column. That is if I have 6 choices, items 5 and 6 are in the second column.
Is there any settings that control this behavior or is it due to some stty settings?
stty -a... (3 Replies)
Discussion started by: newbie_01
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)