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

-w 精确匹配

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

[root@testdb2 ~]# grep -w ls_recurse_enable=YES  /etc/vsftpd/vsftpd.conf
#ls_recurse_enable=YES
ls_recurse_enable=YES

-Fx 完全匹配

[root@testdb2 ~]# grep -Fx ls_recurse_enable=YES  /etc/vsftpd/vsftpd.conf
ls_recurse_enable=YES