WHY

gawk "{if(FNR==NR)a[2*FNR-1]=$0;else a[2*FNR]=$0}END{for(i=1;i<=length(a);i++)print a[i]}" a.txt b.txt > c.txt
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gawk "{a[FNR]=$0\"\n\"a[FNR]}END{for(i=1;i<=length(a);i++)printf a[i]}" b.txt a.txt
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