I have a text file containing
/database/sp/NTR_Vlr_Upload.sql
/database/tables/StatsTables.sql
/mib/ntr.mib
/mib/ntr.v2.mib
/scripts/operations/ntr/IMSITracer.ph
i want the last field after "/" removed like
/database/sp/
/database/tables/
/mib/
/mib/ ... (4 Replies)
All,
I have a field in a comma seperated file with hundreds of lines and about 20 columns and I wish to remove all numbers after the decimal point in field 4 on each line and output the rest to another file or write it back to itself.
File is like this
20070126, 123.0, GBP, 1234.5678,... (9 Replies)
Hello,
I'm new to Perl programming and I have a duplicate 035 tag Voyager application field. The first 035 tag has the information I need but the second 035 tag created the bib id, which I don't need. This incident was performed on several records so I would have to run this script on several... (1 Reply)
Hello, I am using awk to match text in a tab separated field and am able to do so when matching the exact word. My problem is that I would like to match any sequence of text in the tab-separated field without having to match it all. Any help will be appreciated. Please see the code below.
awk... (3 Replies)
Consider my input string as "abc|b f g|bj gy"
I am expecting the output as "abc|bfg|bj gy".
Please let me know how to achieve this in unix?
Thanks (8 Replies)
Hi All,
i have a file having multiple lines but mainly constitues of following two types
1) Sat,Oct,1,01:04:51,2011,Local,ESSBASE0,Info(1051037),Logging,out,user,210073155,,,active,for,63,minutes,GETS_SAL,loaded
2)... (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)
Hello,
I am trying to eliminate rows where the first field is duplicated, leaving the row where the last field is "NET".
Data file:
345234|22.34|LST
546543|55.33|LST
793929|98.23|LST
793929|64.69|NET
149593|49.22|LST
Desired output:
345234|22.34|LST
546543|55.33|LST... (2 Replies)
Hi all,
I have a csv input file with total 60 fields and the fields are not enclosed with double quotes.One of the field(50th field) in this file has line breaks in it which results in the row getting split into multiple lines.This is causing my load(to table) to fail.I tried to enforce double... (3 Replies)
I will start with an example of what I'm trying to do and then describe how I am approaching the issue.
File
PS028,005
Lexeme HRS # M #
PhraseType 1(1:1) 7(7)
PhraseLab 501 503
ClauseType ZYq0
PS028,005
Lexeme W # L> # BNH # M #... (17 Replies)
Discussion started by: jvoot
17 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)