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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,