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Failure using regex with awk in 'while read file' loop

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Top Forums Shell Programming and Scripting Failure using regex with awk in 'while read file' loop
# 8  
Old 04-07-2015
Do you want random lines from the input file? Then shuf the input file before feeding it into above awk proposals.
If you want always the same lines, but presented in random order, shuf the output files lateron.
# 9  
Old 04-07-2015
Quote:
Originally Posted by pathunkathunk
Do I have this basically right?
Code:
{
    A[$1]; # Build array on the first column of the file
    next  # Skip all proceeding blocks and process next line
}
$3 in A # Check in the value in column one of the second files is in the array
{
    # If so print it it to file named based on $3
print > sprintf("%s.txt",$3) 
}

If so, how can I adapt this code to give me only a random subset of matched lines for each array value? Is there a way to redirect the match specified by $3 in A to gshuf -n 2 before printing?
or something along these lines (without pre/post randomization) - not tested
Code:
BEGIN {
   srand()
}
function genrand(n)
{
   return (int(n*rand())+1);
}

{
    A[$1]; # Build array on the first column of the file
    next  # Skip all proceeding blocks and process next line
}
$3 in A { # Check in the value in column one of the second files is in the array
  a[++c]=$0
  file[c]=sprintf("%s.txt",$3) 
}
END {
for(i=1;i<=2;i++) {
  n=genrand(c)
  print a[n] > file[n]
}
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