Can an expert kindly write an efficient Linux ksh script that will strip rows with no numbers from a text file?
Supposing there are three rows that text file called text.txt :
"field1","field2","field3",11,22,33,44
"field1","field2","field3",1,2,3,4
"field1","field2","field3",,,,
The... (5 Replies)
I have a '~' delimited file of 6 - 7 million rows. Each row should contain 13 columns delimited by 12 ~'s. Where there are 13 tildes, the row needs to be removed. Each row contains alphanumeric data and occasionally a ~ ends up in a descriptive field and therefore acts as a delimiter, resulting in... (1 Reply)
hello all
i request you to give the solution for the following problem..
I want read the text file.and print the contents character by character..like if the text file contains google means..i want to print
g
go
goo
goog
googl
google
like this Using unix Shell scripting...
without using... (1 Reply)
Hello,
Please help me. I have hundreds of text files composed of several rows of information and I need to separate each row into a new text file. I was trying to figure out how to split the text file into different text files, based on each row of text in the original text file. Here is an... (2 Replies)
notes: i am using cygwin and notepad++ only for checking this and my OS is XP.
#!/bin/bash
typeset -i totalvalue=(wc -w /cygdrive/c/cygwinfiles/database.txt)
typeset -i totallines=(wc -l /cygdrive/c/cygwinfiles/database.txt)
typeset -i columnlines=`expr $totalvalue / $totallines`
awk -F' ' -v... (5 Replies)
I have a file that contain the following.
-D HTTPD_ROOT="/usr/local/apache"
-D SERVER_CONFIG_FILE="conf/httpd.conf"
I want a shell script, so that after cat filename and apply the shell script I should get the output as follows.
/usr/local/apache/conf/httpd.conf
ie
cat filename |... (7 Replies)
Hi,
I'm using AIX(ksh shell).
> cat temp.txt
"a","b",0
"c",bc",0
"a1","b1",0
"cc","cb",1
"cc","b2",1
"bb","bc",2
I want the output as:
"a","b","c","bc","a1","b1"
"cc","cb","cc","b2"
"bb","bc"
I want to combine multiple lines into single line where third column is same.
Is... (1 Reply)
Hi - I have a file "file1" of below format. Its a comma seperated file. Note that each string is enclosed in double quotes.
"abc","-0.15","10,000.00","IJK"
"xyz","1,000.01","1,000,000.50","OPR"
I want the result as:
"abc","-0.15","10000.00","IJK"
"xyz","1,000.01","1000000.50","OPR"
I... (8 Replies)
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)