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UNIX script for making random numbers without repetition

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# 8  
Old 09-02-2013
OK my mistake, try this:

Code:
awk '
{ V[NR]=$1 }
END {
  srand()
  for(i=1;i<=1440;) {
    v=V[int(1+rand()*7200)]
    if (!(v in N)) {
       N[v]
       print v
       i++
    }
  }
}' random.txt

or even:
Code:
sort random.txt | uniq | shuf | head -1440

This User Gave Thanks to Chubler_XL For This Post:
sajmar
# 9  
Old 09-03-2013
Maybe this one:
Code:
 awk ' {T[NR]=$1} END {srand(); for (i=1; i<=1440; i++) print T[int(1+rand()*NR)]}' file

# 10  
Old 09-03-2013
Nice Rudic, but the requirement was to pick 1440 numbers randomly without any reputation
# 11  
Old 09-03-2013
Rats! Should have read the entire thread. Sorry for that...
# 12  
Old 09-03-2013
Quote:
Originally Posted by sajmar
I think my question was not very clear. I have a file which has one column with 7200 line and want to select 1440 lines ( %20 of the line) randomly without the duplication number between the 1440 numbers.
If you just want 1440 random lines, try
Code:
shuf < inputfile | head -n 1440

# 13  
Old 09-03-2013
Good point Corona688, I'd assumed the random file could contain duplicate entries (that being the nature of random data) and these were to be removed hence my sort and uniq code in post #8.

Your solution is optimal if sajmar doesn't require detection/avoidance of any duplicate values that may occur in the inputfile.
# 14  
Old 09-14-2013
The shuf command will not work for me. could any one give me an awk command for select randomly 1440 out of 7200 numbers which is in one column?
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