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@MyCloudServer ~]# cp /etc/skel/ /home/tuser1 [root@MyCloudServer ~]# chmod 700 /home/tuser1/ [root@MyCloudServer ~]# ll -d /home/tuser1/ drwx------ 2 root root 4096 Sep 2 14:52 /home/tuser1/
2、编辑/etc/group文件,添加组hadoop。
[root@MyCloudServer ~]# groupadd hadoop [root@MyCloudServer ~]# chown :hadoop /etc/group [root@MyCloudServer ~]# ll /etc/group -rw-r--r-- 1 root hadoop 626 Sep 2 14:56 /etc/group
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。
hadoop:x:3005:3005:/home/hadoop:/sbin/nologin
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@MyCloudServer ~]# cp -r /etc/skel/ /home/hadoop [root@MyCloudServer ~]# chown :hadoop /home/hadoop/ [root@MyCloudServer ~]# ll -d /home/hadoop/ drwxr-x--- 2 root hadoop 4096 Sep 2 15:02 /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@MyCloudServer ~]# chown -R :hadoop /home/hadoop/
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@MyCloudServer ~]# grep -i "^s" /proc/meminfo SwapCached: 0 kB SwapTotal: 1015800 kB SwapFree: 1015800 kB Shmem: 144 kB Slab: 36164 kB SReclaimable: 15932 kB SUnreclaim: 20232 kB [root@MyCloudServer ~]# grep "^[sS]" /proc/meminfo SwapCached: 0 kB SwapTotal: 1015800 kB SwapFree: 1015800 kB Shmem: 144 kB Slab: 36168 kB SReclaimable: 15932 kB SUnreclaim: 20236 kB
7、显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户;
[root@MyCloudServer ~]# grep -v "/sbin/nologin$" /etc/passwd | cut -d: -f1 root sync shutdown halt mageia slackware openstack
8、显示/etc/passwd文件中其默认shell为/bin/bash的用户;
[root@MyCloudServer ~]# grep "/bin/bash$" /etc/passwd | cut -d: -f1 root mageia openstack
9、找出/etc/passwd文件中的一位数或两位数;
[root@MyCloudServer ~]# grep -o -E "\<[0-9]{1,2}\>" /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
69
69
89
89
74
74
10、显示/boot/grub/grub.conf中以至少一个空白字符开头的行;

[root@MyCloudServer ~]# grep "^[[:space:]]\+" /boot/grub/grub.conf
[root@MyCloudServer ~]# grep "^[[:space:]]\{1,\}" /boot/grub/grub.conf
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@MyCloudServer ~]# grep "^#[[:space:]]\{1,\}[^[:space:]]\{1,\}" /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.
# 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.
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@MyCloudServer ~]# netstat -tan | grep "\<LISTEN\>[[:space:]]*$" tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp 0 0 :::22 :::* LISTEN tcp 0 0 ::1:25 :::* 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@MyCloudServer ~]# grep "^\([[:alpha:]]\+\>\).*\1$" /etc/passwd sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt bash:x:3006:3006::/home/bash:/bin/bash nologin:x:3009:3009::/home/nologin:/sbin/nologin
原创文章,作者:杜邱,如若转载,请注明出处:http://www.178linux.com/42927


评论列表(1条)
有没有发现黑屏很难看?