题目内容

对于给定的字符串，将倒数第3个he替换成M，并且仅打印被替换操作改变了的行：echo 'he and she here head and ache' | sed -nr '_______________________'he and she Xre head and ache

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仅打印文件hello.txt的第3行，并用-----上下包围该行：$ sed -ne _____________ hello.txt-----This game is good-----

对文件 hello.txt，把从包含"you"的行开始一直到文件结尾整个替换为"\nHave a nice day"$ sed -e '_______________________' hello.txtHello WorldHave a nice day

把所有偶数行替换为---seq 5 | sed '__________'1---3---5

在文件foo.txt的每两行之后添加来自文件address.txt的一行内容$ cat foo.txtbla bla 2015 blablah 2018 blahbla bla blacopyright: 2020$ cat address.txtstart address: 0xA0, func1 address: 0xA0end address: 0xFF, func2 address: 0xB0$ sed -n 'p' address.txt | sed -e '________________' foo.txtbla bla 2015 blablah 2018 blahstart address: 0xA0, func1 address: 0xA0bla bla blacopyright: 2020end address: 0xFF, func2 address: 0xB0