grep 精確匹配與徹底匹配

    [root@testdb2 ~]# grep write_enable=YES /etc/vsftpd/vsftpd.conf     write_enable=YES     #anon_mkdir_write_enable=YES markdown     [root@testdb2 ~]# grep -w write_enable=YES /etc/vsftpd/vsftpd.con

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