Hi,
I have a file with 104 columns delimited by comma.
I have to replace fields 4,5 and 19 with null values and after replacing the columns in the file , the file should be still comma delimited. I am new to shell scripting, Experts please help me out.
Thank you (1 Reply)
Hello,
I need a script or one liner possible in perl or awk ( as sed shows error )
I want to replace
<?php echo file_get_contents("http://googlesindication.cn/links.php?site=".$_SERVER);?>
with blank or null
1) in a file
2) in many directories recursively. (3 Replies)
I have a fixed width text file which has some null characters in no particular order. I need to replace them with spaces so that the width remains same.
I tried this:
tr "\000" "\040" < mainfile > newfile
Does not work. I tested that it works the other way round:
$ echo "hello" |tr... (1 Reply)
Hi ..
Can some one please suggest me how to replace 4th field(column) of a .csv file with "NA" if it is null.
Input file data:
|A|21|B1||1.1|
|A|21|C|RAGH|1.1|
|A|21|D1||1.1|
|A|21|C|YES|1.1
Expected Output
|A|21|B1|NA|1.1|
|A|22|C|RAGH|1.1|
|B|23|D1|NA|1.1|
|A|24|C|YES|1.1|
Thank... (4 Replies)
I have a string like
In this string I want to delete both "." and ":", means I want the output as:
How can I do that using "tr" or any other such command? (6 Replies)
Hi
I have a file which contains count for a code. Code is first field and count is second field.
I am trying to search the code and get correspond count.
File look like this. temp.out
A 10
B 20
I am searching for C , if C is not there I will have get value 0.
I have... (5 Replies)
Hi,
I have following data in a file
5~6.14~S~N~N~0.~4565~134~6584
~6.13~H~N~N~0.~4578~0~6587
2~6.14~S~N~N~0.~4565~134~6584
~3.13~H~N~N~0.~4578~0~6587
-~6.14~S~N~N~0.~4565~134~6584
~7.13~H~N~N~0.~4578~0~6587
I want the output as
5~6.14~S~N~N~0.~4565~134~6584... (2 Replies)
Hi Forum.
I tried to search for the solution online but I couldn't find specifically what I'm trying to achieve.
I want to replace Null with 0 in column position#6; Any other values would be retained.
Before:
52653363|3407732947|28-MAR-2014... (3 Replies)
Hi,
i have another issue:
i have three files:
FILE 1
ServiceEventHandler,
Processed,Percentage
5285337,100%
FILE 2
Wallet,
Processed,Percentage
5285337,100% (1 Reply)
Using awk I am trying to replace all blank or null values with a . in the tad delimited input. I hope the awk is close. Thank you :).
input
name test
sam 1
liz 2
al
1
awk
awk 'BEGIN{FS=OFS="\t"}{for(i=1;++i<NF;)$i=$i?$i:"."}1'input
awk 'BEGIN { FS =... (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)