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Top Forums Shell Programming and Scripting Randomly inserting extra columns into csv file Post 302855391 by Chubler_XL on Thursday 19th of September 2013 06:03:20 PM
Old 09-19-2013
Here is a GNU awk solution, note 1167573600 and 1577800800 are your starting and ending dates:

Code:
$ date -d 'Jan 1 2007' +%s
1167573600

$ date -d 'Jan 1 2020' +%s
1577800800

Code:
awk -F ';' 'BEGIN {
   OFS=FS
   sd=1167573600
   ed=1577800800
   srand()
}
NF>3{
   d1=strftime("%Y%m%d",rand()*(ed-sd)+sd)
   d2=strftime("%Y%m%d",rand()*(ed-sd)+sd)
   d3=strftime("%Y%m%d",rand()*(ed-sd)+sd)
   if(NF>6) $6=(rand()>0.5?"Y":"N") OFS $6
   else $6=rand()>0.5?"Y":"N"
   $4=$4 OFS d1 OFS d2 OFS d3
} 1' infile

 

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rand(3UCB)					     SunOS/BSD Compatibility Library Functions						rand(3UCB)

NAME
rand, srand - simple random number generator SYNOPSIS
/usr/ucb/cc [ flag ... ] file ... int rand(); int srand(seed) unsigned seed; DESCRIPTION
rand() uses a multiplicative congruential random number generator with period 2^32 to return successive pseudo-random numbers in the range from 0 to 2^31 -1. srand() can be called at any time to reset the random-number generator to a random starting point. The generator is initially seeded with a value of 1. SEE ALSO
cc(1B), drand48(3C), rand(3C), random(3C) NOTES
Use of these interfaces should be restricted to only applications written on BSD platforms. Use of these interfaces with any of the system libraries or in multi-thread applications is unsupported. The spectral properties of rand() leave a great deal to be desired. drand48(3C) and random(3C) provide much better, though more elaborate, random-number generators. The low bits of the numbers generated are not very random; use the middle bits. In particular the lowest bit alternates between 0 and 1. SunOS 5.11 30 Oct 2007 rand(3UCB)
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