Shell Programming and Scripting

# usage: temp.sh iterations sample_size seed

iterations=${1:-10} sample_size=${2:-3} # RANDOM=$3

seq_cnt=`cat Infile1 | wc -l`
if [ $sample_size -gt $seq_cnt ]; then echo ss too big!!; exit; fi

iteration=1
while [ $iteration -le $iterations ]; do
  rm -f prev_used_nums.txt unsorted-1.txt unsorted-2.txt
  touch prev_used_nums.txt
  seqs_written=0
  while [ $seqs_written -lt $sample_size ]; do
    let "num_to_use = 1 + ($RANDOM % seq_cnt)"
    grep -q $num_to_use prev_used_nums.txt
    if [ $? -eq 0 ]; then continue; fi # already used $num_to_use
    sed -n "$num_to_use { p; q }" Infile1 >> unsorted-1.txt
    sed -n "$num_to_use { p; q }" Infile2 >> unsorted-2.txt
    echo $num_to_use >> prev_used_nums.txt
    let "seqs_written++"
  done
  sort unsorted-1.txt > OutFile1-$iteration
  sort unsorted-2.txt > OutFile2-$iteration
  let "iteration++"
done

#!/bin/bash
for i in {1..6}
do
	awk -v s=3 -v iter=${i} '
	  NR==FNR { 
	    next 
	  }
	  FNR==1 {
	    if(!set) {
	      srand();
	      n=NR-1
	      for(i=1; i<=s; i++) {
	        line=0
	        while(!line || line in A) line=int(rand()*n)+1
	        A[line]
	      }
	      set=1
	    }
	    close(f)
	    f=FILENAME ".out" iter
	  } 
	  FNR in A {
	    print > f
	  }
	' infile1 infile1 infile2
done