This is a simple function which helps you find out if an (non associative) array has an item. It allows you to call the function with just the array name, not ${arrayname[@]}. It returns 1 if the item is in the array, and 0 if it is not. 继续阅读
Version 1.5 (8 June 2016)
SSL/TLS is a deceptively simple technology. It is easy to deploy, and it just works–except when it does not. The main problem is that encryption is not often easy to deploy correctly. To ensure that TLS provides the necessary security, system administrators and developers must put extra effort into properly configuring their servers and developing their applications.
In 2009, we began our work on SSL Labs because we wanted to understand how TLS was used and to remedy the lack of easy-to-use TLS tools and documentation. We have achieved some of our goals through our global surveys of TLS usage, as well as the online assessment tool, but the lack of documentation is still evident. This document is a step toward addressing that problem.
Our aim here is to provide clear and concise instructions to help overworked administrators and programmers spend the minimum time possible to deploy a secure site or web application. In pursuit of clarity, we sacrifice completeness, foregoing certain advanced topics. The focus is on advice that is practical and easy to follow. For those who want more information, Section 6 gives useful pointers. 继续阅读
AWK单行脚本快速参考 2008年4月28日
编辑： Eric Pement eric [at] pement.org 版本 0.26
翻译： 董一粟 yisudong [at] gmail.com
最新英文版本文件发布在以下地址：
http://www.pement.org/awk/awk1line.txt
最新中文翻译版本文件发布在以下地址：
http://ximix.org/translation/awk1line_zh-CN.txt
翻译问题欢迎联系我：
http://hi.baidu.com/ximix/blog/item/e9334cc2204fa330e5dd3bf2.html
用法：
Unix: awk ‘/pattern/ {print “$1”}’ # 标准 Unix shell环境
DOS/Win: awk ‘/pattern/ {print “$1”}’ # DJGPP 可编译通过
awk “/pattern/ {print \”$1\”}” # GnuWin32，UnxUtils，Mingw环境
需要特别注意的是，DJGPP编译器可以允许awk脚本使用Unix的引号语法
‘/like/ {“this”}’。但是，用户必须知道在DOS/Windows环境下，使用CMD.EXE或者
COMMAND.COM程序的话，单引号并不能保护重定向符号（<, >）和管道（|）。
如果使用双引号的话，在DOS/CMD命令解释器下的特殊符号和他们的特殊含义都
会被忽略。如果你的命令提示符是bash、ksh或者其他的Unix终端，单引号和双引号
会沿用Unix标准的用法。 继续阅读
Press the power button on your system, and after few moments you see the Linux login prompt.
Have you ever wondered what happens behind the scenes from the time you press the power button until the Linux login prompt appears?
The following are the 6 high level stages of a typical Linux boot process.
LSB stands for Linux Standard Base.
LSB was started by Linux Foundation to reduce the difference between several Linux distributions, and thereby reducing the cost involved in porting between different distributions. Init scripts are one among them to be standardized.
In this article, we will see how to write an Init script that conforms to LSBInit Standard.
Init scripts are used to start|stop a software|service. For example, if you are using postgresql software, we will have a Init script named ‘/etc/init.d/postgresql’ which can be used to ‘start|stop|restart|reload|force-reload|status’. 继续阅读
The Linux Standard Base is now on LSB 5. A further evolution of the specification, with considerable internal restructuring, finally delivering on a modular LSB.
This is the approved final version of the LSB 5.0 specification. The tables below present two popular formats, you may also go to the page with all formats.
Release notes outlining changes from the previous release of the specification can be found at http://www.linuxfoundation.org/en/ReleaseNotes50
Note that the LSB 5.0 Core specification set is an evolution of the ISO/IEC International Standard 23360, which corresponded to LSB 3.1. This edition is not to be considered an ISO standard.
LSB 5.0 was released June 3, 2015. 继续阅读
特别说明，本文相关RAID的操作，仅供网友在测试环境里学习和理解戴尔PowerEdge服务器RAID控制卡的功能和使用方法。切勿直接在生产服务器上做相关实验，这可能有误操作并造成数据丢失的风险！
示例演示环境：PowerEdge R620 + H710p Raid控制卡 + 9 x 300G 10k SAS 硬盘 继续阅读
如果我们创建RAID阵列的目的是新部署一台服务器，我们建议所有新创建的RAID阵列都应该做初始化操作，这样，硬盘上原有的用户数据将被清除，以便进行后续的系统，软件安装。
1. 我们临时创建了一个新的RAID1阵列，如图（Disk Group:1；Virtual Disks ID:2)，选中该阵列，按F2，在弹出菜单里选择Initialization
戴尔PowerEdge服务器RAID控制卡的配置，可以使用戴尔提供的多种工具和界面来进行。其中包括H710p板载的PERC BIOS管理界面，生命周期控制器，系统设置，以及OMSA软件等。下面针对不同的使用目的，我们选取推荐的配置工具和界面给大家做个演示。
默认情况下，我们可以使用PERC H710p的板载固化配置管理界面进行大多数的功能配置。如果需要重新初始化RAID卡里硬盘的RAID配置信息，我们可以进行下面步骤：
注：下面PERC卡RAID配置信息初始化的演示，我们将清除PERC卡的磁盘阵列信息，但不清除磁盘上实际存放的用户数据。在后面的实验里，我们将演示在原有的硬盘上创建同样的RAID配置，来恢复硬盘上的用户数据。 继续阅读
MD3000中一块磁盘模式与状态皆显示为不兼容，经确认，可能这块磁盘中有不兼容的或损坏的Raid信息，解决办法是清除磁盘中的Raid信息，由于本地没有合适的Raid卡进行初始化，因此网络查找到能够进行清理的软件。
最后找到了一个暴力的方法，用dd_rescue直接把硬盘上的数据写为0，源代码下载地址：
http://www.garloff.de/kurt/linux/ddrescue/
make后，进入dd_rescue目录
#./dd_rescue -S 931GB /dev/zero /dev/sdb
因为1TB硬盘的实际大小约是931GB,2T约是1862GB，因为raid信息一般那保存在硬盘的最后，只是清除最后1GB就可以了。 继续阅读