我所理解的sed

替换root 为另一个 s sed ‘s/root/yinshi/g’ /etc/passwd c整行替换sed ‘s/root/c"yinshi"’ /etc/passwd c第八行 sed ‘8c"yinshi"’ /etc/passwd p sed -n ‘1p’ /etc/passwd p打印奇数行sed -n ‘1~2p’ 22.txt p打印偶数行sed -n ‘2~2p’ 22.tx

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