1、复制/etc/skel目录为/home/tuser1,要求/home/tuser1及其内部文件的属组和其它用户均没有任何访问权限。
~]# cp -r /etc/skel/ /home/tuser1/ ~]# chmod -R g-rwx,o-rwx /home/tuser1/ ~]# ls -la /home/tuser1/ total 28 d---------. 4 root root 4096 Dec 20 10:56 . drwxr-xr-x. 6 root root 4096 Dec 20 10:19 .. 注意此文件位当前目录上一级目录 ----------. 1 root root 18 Dec 20 10:19 .bash_logout ----------. 1 root root 176 Dec 20 10:19 .bash_profile ----------. 1 root root 124 Dec 20 10:19 .bashrc d---------. 2 root root 4096 Dec 20 10:19 .gnome2 drwx------. 3 root root 4096 Dec 20 10:56 skel
2、编辑/etc/group文件,添加组hadoop。
~]# vim /etc/group distro:x:5000: peguin:x:5001: gentoo:x:3002: fedora:x:3003: mageedu:x:5010:gentoo,fedora fed:x:3004: gentoo1:x:3005: gentoo2:x:3006: hadoop:x:3008: 编辑添加,G-->o在尾行添加
~]# vim /etc/passwd gentoo1:x:3005:3005::/users/gentoo1:/bin/bash gentoo2:x:3006:3006::/users/gentoo:/bin/bash gen:x:3007:3007::/users/gen:/bin/bash hadoop:x:3008:3008::/home/hadoop:/bin/bash
4、复制/etc/skel目录为/home/hadoop,要求修改hadoop目录的属组和其它用户没有任何访问权限。
~]# cp -r /etc/skel/ /home/hadoop ~]# chmod g-rwx,o-rwx /home/hadoop/ ~]# ls -la /home/hadoop/ total 24 drwx------. 3 root root 4096 Dec 20 11:10 . drwxr-xr-x. 7 root root 4096 Dec 20 11:10 .. -rw-r--r--. 1 root root 18 Dec 20 11:10 .bash_logout -rw-r--r--. 1 root root 176 Dec 20 11:10 .bash_profile -rw-r--r--. 1 root root 124 Dec 20 11:10 .bashrc drwxr-xr-x. 2 root root 4096 Dec 20 11:10 .gnome2
5、修改/home/hadoop目录及其内部所有文件的属主为hadoop,属组为hadoop。
~]# chown -R hadoop:hadoop /home/hadoop/ ~]# ls -la /home/hadoop/ total 24 drwx------. 3 hadoop hadoop 4096 Dec 20 11:10 . drwxr-xr-x. 7 root root 4096 Dec 20 11:10 .. 当前目录的上一级目录 -rw-r--r--. 1 hadoop hadoop 18 Dec 20 11:10 .bash_logout -rw-r--r--. 1 hadoop hadoop 176 Dec 20 11:10 .bash_profile -rw-r--r--. 1 hadoop hadoop 124 Dec 20 11:10 .bashrc drwxr-xr-x. 2 hadoop hadoop 4096 Dec 20 11:10 .gnome2
6、显示/proc/meminfo文件中以大写或小写S开头的行;用两种方式;
~]# grep "^[sS]" /proc/meminfo SwapCached: 0 kB SwapTotal: 1048572 kB SwapFree: 1048572 kB Shmem: 232 kB Slab: 66492 kB SReclaimable: 11380 kB SUnreclaim: 55112 kB ~]# grep "^(s|S)" /proc/meminfo 第二种方法 ~]# grep -i "^s" /proc/meminfo 第三种方法
7、显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户;
~]# grep -v "/sbin/nologin$" /etc/passwd root:x:0:0:root:/root:/bin/bash sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt openstack:x:3000:3000::/home/openstack:/bin/bash archinux:x:3001:3001::/home/archinux:/bin/bash gentoo:x:3002:3002::/users/gentoo:/bin/bash fedora:x:3003:3003::/users/fedora:/bin/bash fed:x:3004:3004::/users/fed:/bin/bash gentoo1:x:3005:3005::/users/gentoo1:/bin/bash gentoo2:x:3006:3006::/users/gentoo:/bin/bash gen:x:3007:3007::/users/gen:/bin/bash hadoop:x:3008:3008::/home/hadoop:/bin/bash ~]# grep -v "/sbin/nologin$" /etc/passwd | cut -d: -f1 root sync shutdown halt openstack archinux gentoo fedora fed gentoo1 gentoo2 gen hadoop
~]# grep "/bin/bash" /etc/passwd | cut -d: -f1rootopenstackarchinuxgentoofedorafedgentoo1gentoo2genhadoop
9、找出/etc/passwd文件中的一位数或两位数;
~]# grep -o "[0-9][0-9]\>" /etc/passwd 这是是错误的,默认工作在贪婪模式包含里面数字都匹配 12 10 14 11 12 00 13 30 14 50 99 99 81 81 69 69 73 73 68 68 38 38 99 76 89 89 74 74 72 72 00 00 01 01 02 02 03 03 04 04 05 ~]# grep -E -o "\<[0-9]{1,2}\>" /etc/passwd 必须锚定词首词尾
10、显示/boot/grub/grub.conf中以至少一个空白字符开头的行;
~]# grep -E "^[[:space:]]+" /boot/grub/grub.conf ~]# grep -E "^[[:space:]]+" /boot/grub/grub.conf root (hd0,0) kernel /vmlinuz-2.6.32-504.el6.x86_64 ro root=UUID=cae1b7e9-d579-46d0-9723-51391a99e07f rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet initrd /initramfs-2.6.32-504.el6.x86_64.img
11、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;
~]# grep -E -o "^[[:space:]]+" /boot/grub/grub.conf [root@mytest6 ~]# grep -E "^#[[:space:]]+[^[:space:]]" /etc/rc.d/rc.sysinit # /etc/rc.d/rc.sysinit - run once at boot time # Taken in part from Miquel van Smoorenburg's bcheckrc. # Check SELinux status # Print a text banner. # Only read this once. # Initialize hardware # Set default affinity # Load other user-defined modules # Load modules (for backward compatibility with VARs) # Configure kernel parameters # Set the hostname. ......
12、打出netstat -tan命令执行结果中以‘LISTEN’,后或跟空白字符结尾的行;
~]# netstat -tan | grep "LISTEN[[:space:]]*$" tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 :::22 :::* LISTEN
13、添加用户bash, testbash, basher, nologin (此一个用户的shell为/sbin/nologin),而后找出当前系统上其用户名和默认shell相同的用户的信息;
~]# grep -E -o "^([^:]+\>).*\1$" /etc/passwd
原创文章,作者:让优秀称为一种习惯,如若转载,请注明出处:http://www.178linux.com/64713
评论列表(1条)
掌握的不错,相信正则表达式会对你今后的工作起到很大的益处。