Hi there
I would like to create a shell script to do the following:
- delete a line in file1 if it contains the data string in file2
eg: file1
1 100109942004051510601703694 0.00 0.00
2 100109942004051510601702326 0.00 0.00
3 ... (1 Reply)
First of all, I know this can be more eassily done with perl or other scripting languages but, that's not the issue. I need this in sed. (or wander if it's possible )
I got a file (trace file to recreate the control file from oracle for the dba boys)
which contains
some lines
another line... (11 Replies)
Hello ,
Is there a way to delete lines from a file where data is continously appended to the file. I can use normal vi command ndd to remove n number of lines from the file, as the data is continously appended the line numbers doesnt work. (1 Reply)
Hi
I have a file with lines ending with a date in format dd/mm/yyyy see example below:
a|b|c|08/01/2011
d|a|e|31/11/2010
e|d|f|20/11/2010
f|s|r|18/01/2011
What I would like to do is delete all lines with a date older than 30 days.
With above example I should be left with a file... (5 Replies)
Hi
I am using the following command to delete a line from the file by line number:
line_number=14
sed "${line_number}d" inputfilename > newfilename
Is there a way to modify this command to specify the range of lines to be deleted, lets say from line 14 till line 5 ?
I tried using the... (5 Replies)
Hi folks,
I've list of LDAP records in this format:
cat cmmac.export.tmp2
dn: deviceId=0a92746a54tbmd34b05758900131136a506,ou=devices,ou=customer,ou=nl,o=upc
cmmac: 00:13:11:36:a5:06
dn: deviceId=0a92746a62pbms4662299650015961cfa23,ou=devices,ou=customer,ou=nl,o=upc
cmmac:... (4 Replies)
Hi Guys,
Please help me with my problem here:
I have a source file:
1212 23232 343434 ASAS1 4
3212 23232 343434 ASAS2 4
3234 23232 343434 QWQW1 4
1134 23232 343434 QWQW2 4
3212 23232 343434 QWQW3 4
and a mapping... (4 Replies)
Dear everyone,
I have a file with 900 lines (there is only numbers in one line, no string),
I only need the lines 2+3n (n=0,1...296), i.e line 2, 5, 8, 11...888.
I tried google but only the results such as how to delete all the odd lines or all the even lines with 'awk' command.
Thanks in... (4 Replies)
Hi ,
i have a file with data as below.This is same file. But actual file contains to many rows.
i want to search for a string "Field 039 00" and delete that line and previous 3 lines in that file.. Can some body suggested me how can i do using either sed or awk command ?
Field 004... (7 Replies)
Discussion started by: vadlamudy
7 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)