interleave two text files with specified lines

a_file=$1 a_step=$2 b_file=$3 b_step=$4 a_start=1 let a_end=$a_start+$a_step b_start=1 let b_end=$b_start+$b_step a_lines=$(wc -l $a_file | awk '{print $1}') b_lines=$(wc -l $b_file | awk '{print $

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