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@localhost ~]# cp -rf /etc/skel/ /home/tuser1 [root@localhost ~]# chmod -R go-r /home/tuser1/ [root@localhost ~]# ls -la /home/tuser1/ total 12 drwx--x--x. 3 root root 74 Sep 14 16:48 . drwxr-xr-x. 7 root root 72 Sep 14 16:48 .. -rw-------. 1 root root 18 Sep 14 16:48 .bash_logout -rw-------. 1 root root 193 Sep 14 16:48 .bash_profile -rw-------. 1 root root 231 Sep 14 16:48 .bashrc drwx--x--x. 4 root root 37 Sep 14 16:48 .mozilla
2、编辑/etc/group文件,添加组hadoop。
hadoop:x:3005:
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:/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@localhost ~]# cp -rf /etc/skel/ /home/hadoop [root@localhost ~]# chmod go-r /home/hadoop/ [root@localhost ~]# ls -ld /home/hadoop/ drwx--x--x. 3 root root 74 Sep 14 17:03 /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@localhost ~]# chown -R hadoop:hadoop /home/hadoop/ [root@localhost ~]# ls -ld /home/hadoop/ drwx--x--x. 3 hadoop hadoop 74 Sep 14 17:03 /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@localhost ~]# grep "^[Ss]" /proc/meminfo SwapCached: 0 kB SwapTotal: 3145720 kB SwapFree: 3145720 kB Shmem: 7224 kB Slab: 103844 kB SReclaimable: 57360 kB SUnreclaim: 46484 kB [root@localhost ~]# grep -i "^s" /proc/meminfo SwapCached: 0 kB SwapTotal: 3145720 kB SwapFree: 3145720 kB Shmem: 7224 kB Slab: 103844 kB SReclaimable: 57360 kB SUnreclaim: 46484 kB
7、显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户。
[xw@localhost ~]$ cat /etc/passwd | grep -v "/sbin/nologin$" | cut -d: -f1 root sync shutdown halt xw sg1 slackware openstack hadoop
8、显示/etc/passwd文件中其默认shell为/bin/bash的用户。
[xw@localhost ~]$ cat /etc/passwd | grep "/bin/bash$" | cut -d: -f1 root xw sg1 openstack hadoop
9、找出/etc/passwd文件中的一位数或两位数。
[xw@localhost ~]$ cat /etc/passwd | grep -Eo "\<([0-9]|[1-9][0-9])\>" 0 0 1 1 2 2 3 4 4 7 5 0 6 0 7 0 8 12 11 0 12 14 50 99 99 81 81 59 59 89 89 74 74 32 32 76 38 38 75 75 29 29 42 42 70 70 72 72
10、显示/boot/grub/grub.conf中以至少一个空白字符开头的行。
[root@xw-pc02 ~]# cat /boot/grub/grub.conf | grep -E "^[[:space:]]+" root (hd0,0) kernel /vmlinuz-2.6.32-642.el6.x86_64 ro root=/dev/mapper/vg_xwpc02-lv_root rd_NO_LUKS.UTF-8 rd_LVM_LV=vg_xwpc02/lv_root rd_NO_MD rd_LVM_LV=vg_xwpc02/lv_swap SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet initrd /initramfs-2.6.32-642.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@xw-pc02 ~]# 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). # Check to see if a full relabel is needed # Update quotas if necessary # 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’后跟0、1或多个空白字符结尾的行。
[xw@localhost ~]$ netstat -tan | grep "LISTEN[[:space:]]*$" tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp6 0 0 :::22 :::* LISTEN tcp6 0 0 ::1:631 :::* LISTEN tcp6 0 0 ::1:25 :::* LISTEN
13、添加用户bash, testbash, basher, nologin (此一个用户的shell为/sbin/nologin),而后找出当前系统上其用户名和默认shell相同的用户的信息。
[root@localhost ~]# grep -E "^([^:]+\>).*\1$" /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:萝卜,如若转载,请注明出处:http://www.178linux.com/43474
评论列表(1条)
排版不是很棒,可以在想想怎么来做