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×÷Õß: anhui    •rég: 2007-12-06 21:45
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×÷Õß: nuclearxin    •rég: 2007-12-06 23:05
awk '{print}NR%20==0{a="sleep 2  &";{print a}}'
×÷Õß: dreamfly5    •rég: 2007-12-06 23:56
sed -i '20~20asleep 2  &'  file




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