Hello all,
I've a CSV file and need to replace 5th field if its value is "X".
The exact requirement is to replace 5th field (column) with "Y" if
a. it's value is "X" AND
b. the line must start with ABC string
i guess this can be done with awk. Pl help.
For security reasons, the... (2 Replies)
Hi,
I need to create a csv file to store oracle query output. This report need to be created on hourly basis. The csv file report format as "Report_22_Sep_09_13IST.csv". I have the oracle query. Now i need to create and move the oracle query output to the report row by row starting from 3rd row.... (6 Replies)
Hi everyone,
im a newbie so plz bare with me, i have this txt file which contains an output of a query from oracle. now i copied the string inside this txt file in a .csv file. i used this command in doing this process:
echo "Fatal alerts:", $(cat a.txt) > test.csv
now what i want to... (1 Reply)
Hi
i am new to scripting. i have a file file.dat with content as :
CONTENT_STORAGE PERCENTAGE FLAG:
/storage_01 64% 0
/storage_02 17% 1
I need to update the value of FLAG for a particular CONTENT_STORAGE value
I have written the following code
#!/bin/sh
threshold=20... (1 Reply)
Hi All
Thanks for all your post and advice, you have been extremely helpful in the past.
I have an issue where I'm stumped and am seeking a wider opinion.
I'm relatively new to unix and have been tasked with collating a vast amount of data and presenting it within excel.
Now the... (5 Replies)
i want to run update query for oracle which is in up.sql taking values from a.csv.
I have implemented shell script to do it.
extn="perl"
ls -1 | while read file
do
echo "$file,$extn" > a.csv
done
up.sql contains
update file_list set filename=$1 where extn=$2;
The code to update is... (2 Replies)
I have a .CSV file (file.csv) whose data are all enclosed in double quotes. Sample format of the file is as below:
column1,column2,column3,column4,column5,column6, column7, Column8, Column9, Column10
"12","B000QRIGJ4","4432","string with quotes, and with a comma, and colon: in... (3 Replies)
Hi,
I have a file of csv data, which looks like this:
file1:
1AA,LGV_PONCEY_LES_ATHEE,1,\N,1,00020460E1,0,\N,\N,\N,\N,2,00.22335321,0.00466628
2BB,LES_POUGES_ASF,\N,200,200,00006298G1,0,\N,\N,\N,\N,1,00.30887539,0.00050312... (10 Replies)
In the out.txt below I am trying to use awk to update the contents of $9.. If $9 contains a + or - then $8 of out.txt is used as a key to lookup in $2 of file. When a match ( there will always be one) is found the $3 value of that file is used to update $9 of out.txt separated by a :. So the... (6 Replies)
Discussion started by: cmccabe
6 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)