马哥教育网络21期+第五周练习博客
1、显示/boot/grub/grub.conf中以至少一个空白字符开头的行; [root@localhost ~]# egrep "^[[:space:]]+.*" /boot/grub/grub.conf 2、显示/etc/rc.d/rc.sysinit文件中以#开头,后面跟至少一个空白字符,而后又有至少一个非空白字符的行; egrep "^[#][[:space:]]+[^[:space:]]+" /etc/rc.d/rc.sysinit 3、打出netstat -tan命令执行结果中以‘LISTEN’,后或跟空白字符结尾的行; [root@localhost ~]# netstat -tan | egrep "\<LISTEN\>.*[[:space:]]$" 4、添加用户bash, testbash, basher, nologin (此一个用户的shell为/sbin/nologin),而后找出当前系统上其用户名和默认shell相同的用户的信息; [root@localhost ~]# egrep "(^[[:alnum:]]+\>).*\1$" /etc/passwd 5、显示当前系统上root、fedora或user1用户的默认shell; [root@localhost ~]# egrep "^(root|fedora|user1)" /etc/passwd | cut -d':' -f7 /bin/bash /bin/bash /bin/bash 6、找出/etc/rc.d/init.d/functions文件中某单词后面跟一组小括号的行,形如:hello(); [root@localhost ~]# egrep "\<[[:alnum:]]+\>\(\)" /etc/rc.d/init.d/functions 7、使用echo命令输出一个绝对路径,使用grep取出其基名; 扩展:取出其路径名 echo "/etc/passwd" | grep -E -o "[^/]+/?$" | cut -d"/" -f1 [root@localhost ~]# echo "/etc/passwd" | egrep -o "[^/]+/+" | cut -d'/' -f1 etc 8、找出ifconfig命令结果中的1-255之间数字; ifconfig | egrep -o "([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-5][0-5])" 如果要匹配的是完整数字组: [root@localhost ~]# ifconfig | egrep "\<([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-5][0-5])\>" 9、挑战题:写一个模式,能匹配合理的IP地址; [root@localhost ~]# ifconfig | egrep -o "\<([1-9]|[1-9][0-9]|1[0-9][1-9]|2[0-5]([0-4]|[6-9]))[.]([0-9]|[1-9][0-9]|1[0-9][1-9]|2[0-4][0-9])[.]([0-9]|[1-9][0-9]|1[0-9][1-9]|2[0-4][0-9])[.]([0-9]|[1-9][0-9]|1[0-9][1-9]|2[0-4][0-9])\>" 192.168.1.5 127.0.0.1 10、挑战题:写一个模式,能匹配出所有的邮件地址; egrep "([[:alnum:]]+[:punct:]|[[:alnum:]]+)@([[:alnum:]]+\.|[[:alpha:]]+\.?|[[:alpha:]]+?)" 11、查找/var目录下属主为root,且属组为mail的所有文件或目录; [root@wanghongkai ~]# find /var -user root -group mail /var/spool/mail 12、查找当前系统上没有属主或属组的文件; [root@wanghongkai ~]# find /home -nouser -a -nogroup 进一步:查找当前系统上没有属主或属组,且最近3天内曾被访问过的文件或目录; [root@wanghongkai ~]# find /home -nouser -a -nogroup -atime -3 13、查找/etc目录下所有用户都有写权限的文件; [root@wanghongkai ~]# find /var -perm -222 -ls 393803 0 srw-rw-rw- 1 root root 0 Jul 30 06:19 /var/run/rpcbind.sock 393831 0 srw-rw-rw- 1 root root 0 Jul 30 06:19 /var/run/acpid.socket 14、查找/etc目录下大于1M,且类型为普通文件的所有文件; [root@wanghongkai ~]# find /etc -size +1M -type f /etc/selinux/targeted/modules/active/policy.kern /etc/selinux/targeted/policy/policy.24 /etc/yum.repos.d/httpd-2.2.31.tar.bz2 /etc/yum.repos.d/httpd-2.2.31/srclib/apr/.libs/libapr-1.a /etc/yum.repos.d/httpd-2.2.31/srclib/apr/configure /etc/yum.repos.d/httpd-2.2.31/.libs/httpd /etc/yum.repos.d/httpd-2.2.31/server/.libs/libmain.a /etc/gconf/gconf.xml.defaults/%gconf-tree.xml 15、查找/etc/init.d/目录下,所有用户都有执行权限,且其它用户有写权限的文件; [root@wanghongkai ~]# find /etc/init.d/ -perm -113 -ls 16、查找/usr目录下不属于root、bin或hadoop的文件; [root@wanghongkai ~]# find /usr -not -user root -a -not -user bin -a -not -user hadoop /usr/local/apache2/man/man8/logresolve.8 /usr/local/apache2/man/man8/htcacheclean.8 /usr/local/apache2/man/man8/suexec.8 /usr/local/apache2/man/man8/apachectl.8 [root@wanghongkai ~]# find /usr -not \( -user root -o -user bin -o -user hadoop \) /usr/local/apache2/man/man8/logresolve.8 /usr/local/apache2/man/man8/htcacheclean.8 /usr/local/apache2/man/man8/suexec.8 /usr/local/apache2/man/man8/apachectl.8 /usr/local/apache2/man/man8/rotatelogs.8 /usr/local/apache2/man/man8/httpd.8 /usr/local/apache2/man/man8/apxs.8 /usr/local/apache2/man/man8/ab.8 /usr/local/apache2/man/man1/htpasswd.1 /usr/local/apache2/man/man1/htdigest.1 17、查找/etc/目录下至少有一类用户没有写权限的文件; [root@wanghongkai ~]# find /etc -not -perm /222 /etc/shadow- /etc/shadow /etc/ld.so.conf.d/kernel-2.6.32-358.el6.x86_64.conf /etc/gshadow /etc/sudoers /etc/pam.d/cups 18、查找/etc目录下最近一周内其内容被修改过,且不属于root或hadoop的文件; [root@wanghongkai ~]# find / -nouser -a -nogroup -a -atime -7
原创文章,作者:wostop,如若转载,请注明出处:http://www.178linux.com/26930
评论列表(1条)
写的很好,排版也很棒,加油