sed -n 'm,np'查看文件的m行～n行的信息
➜ cafe2cold cat test.txt
line1
line2
line3
line4
➜ cafe2cold sed -n '2,3p' test.txt
line2
line3
➜ cafe2cold cat test.txt
line1
line2
line3
line4
➜ cafe2cold sed -n '2,3p' test.txt
line2
line3
本文标题：sed -n 'm,np'显示文件指定行
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