使用示例1:seq 30 > aaa.txt
awk '5 < NR && NR < 10' aaa.txt
awk '{if( 5 < NR && NR < 10 ) printf $0 "\n"}' aaa.txt
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使用示例2:seq 30 > aaa.txt
awk '/^c/ || /^r/' aaa.txt
awk '/^c/ || /^r/ {print}' aaa.txt
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