Make sure there are no empty lines otherwise they will be replaced by 4 commas. You could exclude that by testing for the number of fields.. ( NF{ $4 .. )
Is the second line part of the first line? If not, does it not need to get changed too?
Is it possible to add a new column in a file by matching a key element in second file ?
File 1
2 a
3 b
4 d
5 g
6 j
7 m
File 2
4 hjjjj
5 aaa
6 sasa
7 dsds
2 dsdf
3 fdsfg (2 Replies)
Dear all,
Does anyone know how I could to add a column of numbers (1s, or 2s, or..., or 6s) to two-column text files (tab-delimited), where the specific number to be added varies as a function of the file naming?
Currently, each of my text files has two columns, so the column with the... (12 Replies)
Hello Friends,
i used awk to sum up total size of files under a directory (with the help of examples, threads here).
ls -l | awk '/^-/ {total += $5} END {printf "%15.0f\n",total}' >> total.txt
After each execution of the script total result is appended into a text file:
7010
7794
8890 ... (7 Replies)
Hi All ,
Kindly help me with this soln
awk '{printf "%s %7s \n", $1,$c}' infile
where
value of variable c I am externally giving input
But executing the above command shows all the columns of infile where as I want only 1st column of infile and 2nd column should print value c (8 Replies)
Helle,
I want to create a .ksh script in order to realize the following :
I have a .txt file organized in a bloc of information, each bloc start with 000 as following:
000...
001...
003...
004...
000...
001...
003...
004...
.
.
My aim is to add a new... (6 Replies)
I saved the csv file in a comma delimited format.
Sample input
input.csv
1 abc 2
2 def 4
3 ghi 6
4 jkl 8
5 mno 10
output.csv should look like this with single quotes around each field
'1' 'abc' '2'
'2' 'def' '4'
'3' 'ghi' '6'
'4' 'jkl' '8'
'5' 'mno' '10'
Please help me :confused:... (3 Replies)
File contains 2 fields with tab delimeter. i want added the one column first of the file and incrementing as like sequence
Sample file:
Fname lanme
raj rajkumar
rani ranikumar
output file should be.
name Fname lanme
1 raj rajkumar
2 rani ranikumar
Please help... (1 Reply)
Hi,
I am trying to get the file in particular pattern using shell script. I have to add one column to some other file.
For example consider two file as below.
File1:
name1
name2
name3
File2:
Add1 age1
Add2 age2
Add3 age3
I want this two file in a single file format something like... (3 Replies)
Hi,
I am having a file in the following format.
for aaaa
1111 1234
2222 3434
for bbbb
1111 3434.343
2222 2343
for cccc
3333 2343.343
4444 89000
for dddd
1111 5678.343
2222 890.3
aaaa 2343.343
bbbb 34343.343 (5 Replies)
Hi,
Can anyone please explain me how can I add a new column to a Csv file ?
Actaully I am setting one set of commands and creating a CSV file with 4 columns.
I am executing another command and it's output should be added as column 5 with a column heading ?
Can anyone explain how can... (26 Replies)
Discussion started by: rrb2009
26 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)