第四周
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。
[root@zf ~]# cp -r /etc/skel/ /home/tuser1 [root@zf ~]# chmod -R go= /home/tuser1/ [root@zf ~]# ls -al /home/tuser1/ 总用量 28 d-wx------. 4 root root 4096 12月 16 06:17 . drwxr-xr-x. 8 root root 4096 12月 16 06:17 .. -rw-------. 1 root root 18 12月 16 06:17 .bash_logout -rw-------. 1 root root 176 12月 16 06:17 .bash_profile -rw-------. 1 root root 124 12月 16 06:17 .bashrc drwx------. 2 root root 4096 12月 16 06:17 .gnome2 drwx------. 4 root root 4096 12月 16 06:17 .mozilla
2、编辑/etc/group文件，添加组hadoop。
[root@zf ~]# echo "hadoop:x:2021:" >> /etc/group [root@zf ~]# cat /etc/group | tail -2 nova:x:2020:openstack hadoop:x:2021:
3、手动编辑/etc/passwd文件新增一行，添加用户hadoop，其基本组ID为hadoop组的id号；其家目录为/home/hadoop。
[root@zf ~]# echo "hadoop:x:1001:2021::/home/hadoop:/bin/bash" >> /etc/passwd [root@zf ~]# cat /etc/passwd | tail -2 openstack:x:3003:2019::/home/openstack:/bin/bash hadoop:x:1001:2021::/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。
[root@zf ~]# cp -r /etc/skel/ /home/hadoop [root@zf ~]# chmod go= /home/hadoop/ [root@zf ~]# ls -ld /home/hadoop/ drwx------. 4 root root 4096 12月 16 07:43 /home/hadoop/
5、修改/home/hadoop目录及其内部所有文件的属主为hadoop，属组为hadoop。
[root@zf ~]# chown -R hadoop.hadoop /home/hadoop/ [root@zf ~]# ls -la /home/hadoop/ [root@zf ~]# ls -la /home/hadoop/ 总用量 28 drwx------. 4 hadoop hadoop 4096 12月 16 07:43 . drwxr-xr-x. 9 root root 4096 12月 16 07:43 .. -rw-r--r--. 1 hadoop hadoop 18 12月 16 07:43 .bash_logout -rw-r--r--. 1 hadoop hadoop 176 12月 16 07:43 .bash_profile -rw-r--r--. 1 hadoop hadoop 124 12月 16 07:43 .bashrc drwxr-xr-x. 2 hadoop hadoop 4096 12月 16 07:43 .gnome2 drwxr-xr-x. 4 hadoop hadoop 4096 12月 16 07:43 .mozilla
6、显示/proc/meminfo文件中以大写或小写S开头的行；用两种方式；
[root@zf ~]# grep "^[sS].*" /proc/meminfo SwapCached: 0 kB SwapTotal: 2097144 kB SwapFree: 2097144 kB Shmem: 432 kB Slab: 99732 kB SReclaimable: 42004 kB SUnreclaim: 57728 kB [root@zf ~]# grep -E "^(s|S).*" /proc/meminfo SwapCached: 0 kB SwapTotal: 2097144 kB SwapFree: 2097144 kB Shmem: 432 kB Slab: 99720 kB SReclaimable: 42000 kB SUnreclaim: 57720 kB
7、显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户；
[root@zf ~]# grep -v "/sbin/nologin$" /etc/passwd | cut -d: -f1 root sync shutdown halt aa mageia slackware openstack hadoop
8、显示/etc/passwd文件中其默认shell为/bin/bash的用户；
[root@zf ~]# cat /etc/passwd | grep "/bin/bash$" | cut -d: -f1 root aa mageia openstack hadoop
9、找出/etc/passwd文件中的一位数或两位数；
[root@zf ~]# cat /etc/passwd | grep -E -o "\<[0-9]\>|\<[1-9][0-9]\>" 0 0 1 1 2 2 3 4 4 7 5 0 6 0 7 0 8 12 10 14 11 0 12 13 30 14 50 99 99 81 81 69 69 32 32 29 29 68 68 42 42 38 38 48 48 76 89 89 74 74 72 72
10、显示/boot/grub/grub.conf中以至少一个空白字符开头的行；
[root@zf ~]# cat /boot/grub/grub.conf | grep -E "^[[:space:]]+[[:alnum:]]+" root (hd0,0) kernel /vmlinuz-2.6.32-431.el6.x86_64 ro root=UUID=10c8f38a-aa7e-44ba-81e2-bddbb6689b7c rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet initrd /initramfs-2.6.32-431.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；
[root@zf ~]# cat /etc/rc.d/rc.sysinit | grep -E "^#[[:space:]]+[^[:space:]]+" # /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. # Sync waiting for storage. # Device mapper & related initialization # Start any MD RAID arrays that haven't been started yet # Remount the root filesystem read-write. # Clean up SELinux labels # If relabeling, relabel mount points. # Mount all other filesystems (except for NFS and /proc, which is already # mounted). Contrary to standard usage, # filesystems are NOT unmounted in single user mode. # The 'no' applies to all listed filesystem types. See mount(8). # Update quotas if necessary # Check to see if a full relabel is needed # Initialize pseudo-random number generator # Configure machine if necessary. # Clean out /. # Do we need (w|u)tmpx files? We don't set them up, but the sysadmin might... # Clean up /var. # Clean up utmp/wtmp # Clean up various /tmp bits # Make ICE directory # Start up swapping. # Set up binfmt_misc # Boot time profiles. Yes, this should be somewhere else. # Now that we have all of our basic modules loaded and the kernel going, # let's dump the syslog ring somewhere so we can find it later # create the crash indicator flag to warn on crashes, offer fsck with timeout # Let rhgb know that we're leaving rc.sysinit
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；
[root@zf ~]# netstat -tan | grep -E "LISTEN[[:space:]]*$" tcp 0 0 0.0.0.0:60812 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:10050 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN tcp 0 0 :::111 :::* LISTEN tcp 0 0 :::39216 :::* LISTEN tcp 0 0 :::22 :::* LISTEN tcp 0 0 ::1:631 :::* LISTEN tcp 0 0 ::1:25 :::* LISTEN tcp 0 0 :::3306 :::* LISTEN
13、添加用户bash, testbash, basher, nologin (此一个用户的shell为/sbin/nologin)，而后找出当前系统上其用户名和默认shell相同的用户的信息；
[root@zf ~]# useradd bash [root@zf ~]# useradd testbash [root@zf ~]# useradd basher [root@zf ~]# useradd -s /sbin/nologin nologin [root@zf ~]# shell=$(grep "basher" /etc/passwd | cut -d: -f7) [root@zf ~]# grep "$shell" /etc/passwd | cut -d: -f1 root aa mageia openstack hadoop bash testbash basher
14、显示/proc/meminfo文件中以大写或小写S开头的行；用三种方式；
[root@zf ~]# grep "^[sS].*" /proc/meminfo SwapCached: 0 kB SwapTotal: 2097144 kB SwapFree: 2097144 kB Shmem: 432 kB Slab: 99732 kB SReclaimable: 42004 kB SUnreclaim: 57728 kB [root@zf ~]# grep -E "^(s|S).*" /proc/meminfo SwapCached: 0 kB SwapTotal: 2097144 kB SwapFree: 2097144 kB Shmem: 432 kB Slab: 99720 kB SReclaimable: 42000 kB SUnreclaim: 57720 kB [root@zf ~]# grep -i "^s.*" /proc/meminfo SwapCached: 0 kB SwapTotal: 2097144 kB SwapFree: 2097144 kB Shmem: 432 kB Slab: 99808 kB SReclaimable: 42060 kB SUnreclaim: 57748 kB
15、显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户；
[root@zf ~]# grep -v "/sbin/nologin$" /etc/passwd | cut -d: -f1 root sync shutdown halt aa mageia slackware openstack hadoop bash testbash basher
16、显示/etc/passwd文件中其默认shell为/bin/bash的用户；
[root@zf ~]# grep "/bin/bash$" /etc/passwd | cut -d: -f1 root aa mageia openstack hadoop bash testbash basherp
17、找出/etc/passwd文件中的一位数或两位数；
[root@zf ~]# grep -E -o "\<[0-9]\>|\<[1-9][0-9]\>" /etc/passwd 0 0 1 1 2 2 3 4 4 7 5 0 6 0 7 0 8 12 10 14 11 0 12 13 30 14 50 99 99 81 81 69 69 32 32 29 29 68 68 42 42 38 38 48 48 76 89 89 74 74 72 72
原创文章，作者：N25-深圳-寻觅，如若转载，请注明出处：http://www.178linux.com/64396
评论列表（1条）
正则表达式很容易将人的水平区分开来，作业中完成的很不错，再接再励。