题目内容
抽取文件sample.txt中所有包含“do”且只有两行的段落$ cat sample.txtHello WorldGood dayHow are youJust do-itBelieve itToday is sunnyNot a bit funnyNo doubt you like it tooMuch ado about nothingHe he he# 要求输出的尾部不能有多余的空行$ awk '____________________'Just do-itBelieve itMuch ado about nothingHe he he
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