Shell

Michael Stutz, author of the Linux Cookbook, has summed up 10 good habits with his many years of experience in using UNIX, and personally believes that it is really useful, and is summarized below to share with you.1. Create a hierarchy directory:

#函数: Must be defined before using#格式:#function_name () {# List of commands# [return value] #可以显示增加return语句, if not added, the last command runs the result as a return ##返回值只能是整数, generally used for function execution success or not, 0 for success,

Overview What is a shell?The shell acts as an interface between the user and the Linux system, allowing the user to enter commands that need to be executed to the operating system. This is much like the command prompt for Windows, but the strong is

Tag: TR WC split cutCut interceptCut-d:-f+ number + file to take the first paragraph of the file, with a comma between multiple numbersCut-c intercept the first few characters (3-5 3 to 5)Sort sorts-T delimiter-U to repeat-N Sort by number-K

Escape characters:650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M02/82/B1/wKioL1dekCOAJOxMAADJVCjDcdk147.png "title=" QQ picture 20160613180543.png "style=" Float:none; "alt=" Wkiol1dekcoajoxmaadjvcjdcdk147.png "/>When parsing text, double

Basic format:Test expressionExpression constructed for the test command.Here expression is any valid expression that the test command can understand, and the simplified format will be the most common format that the reader may aiiowed seereturn

#!/bin/bashName="Matto" #变量名和等号之间不能有空格 #name="Blog4matto" #重定义name变量 #readonly name #设置name为只读变量 # unset name #删除变量, you cannot delete a read-only variable #${name}

#输入输出重定向: Unix gets input from stdin by default, stdout output, input device is keyboard, output device is terminal#输出重定向: The clear output can be not only the monitor, but also the transfer to the file, which is called the output

Shell IntroductionThe shell is the user interface of the system and provides an interface for users to interoperate with the kernel. It receives the command entered by the user and feeds it into the kernel to execute.Running backgroundA basic Linux

The actual combat target for the log desensitization, the log directory of all the files processed, all involved in the card number and password information, will be replaced by "*" number, to replace the contents are obtained from the corresponding

1. Regular and wildcard characters The wildcard characters in Linux are used to match the file names, and their matches are exact matches. Only wildcard characters are supported, command has LS find CP and other commandsThe regular is used to match

It's annoying to unload the system following the OPENJDK and then install the orcle jdk every time, soWriting a script execution is a hassle, just put the following bash script and the one you're downloadingThe jdk-7u79-linux-x64.tar.gz package can

Classification of regular expressions Basic Regular Expressions (basic Regular expression also known as basic RegEx abbreviation Bres) Extended Regular expression (Extended Regular expression also known as Extended RegEx abbreviation

and a supplier to check the data, the other side is the gmt+0 time zone, our report default Beijing time, can not be modified to GMT0,When you export data in Excel to Excel by hour, and then to a text file, the shell turns to GMT0 for statistics:Pre-

Print out 1,11,21,31,41 ... The shell scriptmethod One:#!/bin/Bash for((i=1;i the; i=i+Ten)); Doecho $i #cat-n/etc/services | Sed-n"${i}p"#sed-N"${i}p"/etc/ServicesdoneOperation process, first cycle:1;1echo "1"Second cycle:1=1+10=11;11echo "11"Third

First shell script--helloworld[Email protected] ~]# VI sh01.sh#!/bin/bash #! Indicates which shell# this is my first shell script #注释部分echo-E "Hello world!" Exit 0[[email protected]~]# SH sh01.sh # execute SH file Hello world! using bash or SH

1 , first to open HBase, Use JPS View ProcessJPS is the Java Process State tool, which returns the process ID and service name[Email protected]:~/apache/hbase-0.94.15-security$ JPS3082 NameNode6245 Hregionserver3493 Jobtracker6064 Hmaster5999

1. SortA. Sorting strings by default　　B. With-r option: Reverse sort　　C. Specify the option data field separator with-T, and the-K option specifies the data field to compare　　D. Use the-N option to specify "pure digit sorting". As can be seen in the

Hackers exploit this vulnerability to execute arbitrary code, even without the need for authentication, to remotely gain control of the system, including executing malicious programs, or implanting Trojan horses within the system, or obtaining

Suddenly want to find a place to write a little article, and think of this old account, not because of the long-term silence was deleted is very touched ... All right, let's just commemorate this. First day.I suddenly wanna write something and