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正则表达式 :1,$s/tom/David/g :1,$s/David/g 下列语句的结果 /love/ /ovea-zA-Z0-9/ /love/ /love$/ /l.ve/ /o*ve/ /Llove/ /ovea-z/ grep Grep的工作模式 grep root /etc/passwd ps ef | grep root grep n root: /etc/passwd Grep with options Grep with pipes Egrep Linux and Gnu grep Fixed grep Recursive grep Grep with options sed