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gawk -vN=4 "NR>FNR;NR==FNR{if(NR>N){print a[NR%N]}{a[NR%N]=$0;NN=NR}}END{for(i=NN-N;++i<=NN;)if(i%N in a)print a[i%N]}" 1.txt 2.txt>3.txt复制代码
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sed "4r2.txt" 1.txt>3.txt复制代码
sed -e "4r2.txt" -e "5s/^/\n/" 1.txt>3.txt复制代码