LINUX 之路-有多远走多远

securitypluscn

下一步LINUX学习计划

• SECURITY+ 之后立刻买RHCE考试票。今年搞定RHCE！
• 每天看两个小时LINUX资料。
• 给老师作助教。
• 争取个LAMP PROJECT 做做。
• POLISH MY SHELL SCRIPTING SKILLS。
  

kooleon

这个少年可以啵

kooleon

回复 20# securitypluscn
各有各的优势，要看你用来做什么了。


   

securitypluscn

kooleon 发表于 2013-07-04 15:41
这个少年可以啵

多谢前辈鼓励！

securitypluscn

kooleon 发表于 2013-07-04 15:42
回复 20# securitypluscn
各有各的优势，要看你用来做什么了。

对于新手来说学的面广一些好找工作。当然要有重点，且学的有关联。

securitypluscn

RHCE

今天开始读”鸟哥的私房菜-服务器“

先复习网路基础概念。 http://vbird.dic.ksu.edu.tw/linu ... _basic.php#fig2.1-1
2.1-2.2 DONE

securitypluscn

新学的一招，仅仅升级SECURITY PAKAGES，摘自：http://blog.toracat.org/


CentOS and Scientific Linux users should see the Notes below]

In Enterprise Linux, it is often desirable to minimize the number of updates to install. Many admins just want to apply security-related updates. This is easily done using yum security plugin. First, install the plugin:

yum install yum-plugin-security

To install only the security updates :

yum --security update

You’ll see something similar to:

===================================================================================
Package           Arch        Version             Repository                 Size
===================================================================================
Updating:
mysql             x86_64      5.1.69-1.el6_4      rhel-x86_64-server-6      907 k
mysql-libs        x86_64      5.1.69-1.el6_4      rhel-x86_64-server-6      1.2 M
mysql-server      x86_64      5.1.69-1.el6_4      rhel-x86_64-server-6      8.7 M

Transaction Summary
===================================================================================

That’s it. But there are many other things you can do. For example, yum updateinfo has some handy options. Try the following:

yum updateinfo summary
yum updateinfo list security
yum updateinfo list available
yum updateinfo list bugzillas

The first command may show:

Updates Information Summary: available
    3 Important Security notice(s)
    2 Bugfix notice(s)
updateinfo summary done

The second command will display the advisory info such as:

RHSA-2013:0772 Important/Sec. mysql-5.1.69-1.el6_4.x86_64

Then you can apply the update based on the advisory:

yum update --advisory RHSA-2013:0772

Notes for CentOS and Scientific Linux users
At the time of this writing, CentOS does not have the yum security feature implemented. This may change in a near future. Stay tuned.

Scientific Linux has been providing the package updates in two repositories, sl-security and sl-fastbugs. The sl-security repo contains security-related packages plus their dependencies and is shipped enabled by default. The sl-fastbugs repository is for non-security updates which is shipped disabled. Thus, applying security only updates is the default behavior.

securitypluscn

今天整理硬盘，发现两个文件即使ROOT也删不掉。
[root@abc Linux]# ll
total 8
drwxrwxr-x. 2 student student 4096 Jul  8 00:15 week03
drwxrwxr-x. 2 student student 4096 Feb  5 16:18 week04
[root@abc Linux]# rm -rf *
rm: cannot remove `week03/attrtest': Operation not permitted
rm: cannot remove `week04/test': Operation not permitted
[root@abc Linux]#
首先想到的是ACL，但显然不是。 其次想到的这两个目录不在本地硬盘上，也不是。百思不得其解。在仔细看看文件名，顿悟！这两个文件是我上课时做的小实验，ATTRTEST 实乃ATTRIBUTE TEST 也！
[student@abc Linux]$ cd week03
[student@abc week03]$ lsattr *
----ia---j---e- attrtest
[student@abc week03]$ cd ../wee04
bash: cd: ../wee04: No such file or directory
[student@abc week03]$ cd .. /week04
[student@abc Linux]$ lsattr *
----ia---j---e- week03/attrtest
这下不会忘了！

方兆国

securitypluscn 发表于 2013-06-05 13:20
回复 9# Shell_HAT

"rm -rf / tmp/test.log"  这是什么命令？  一会儿试试

你用root权限输
rm -rf /
试一下，影响更加深刻

securitypluscn

方兆国 发表于 2013-07-11 14:47
你用root权限输
rm -rf /
试一下，影响更加深刻

您这招不给力啊！

root@abc ~]# rm -rf /
rm: it is dangerous to operate recursively on `/'
rm: use --no-preserve-root to override this failsafe
[root@abc ~]#