ps4 trove

The PID of the bash shell parent process Prompt_command is set, this command is executed before the command line main prompt is displayed. PS1 Main command line prompt string PS2 Times command line prompt string PS3 Prompt for the Select command PS4 If you use the Bashde-x parameter, the prompt that appears before the command line is displayed

This time to talk about "log"."Log" refers to the "record" that is left by the system or software. From the "logbook" that represents the "logbook".Often hear "when the problem occurs, or the program does not install its own expected to run, please look at the log!" 」。Indeed, the "log" that records the detailed operation of the system and software is a treasure trove of information, and there are many cases of solving the problem through logs.But in f

libraryThird-party libraries, have to mention the famous jquery, is now basically a domestic web development of the required tools. Its flexible DOM operation makes many web developers addicted to it. Together with a well-established jquery UI Library and a large number of jquery plugins, it's almost an inexhaustible treasure trove. However, can it be combined with ANGULARJS?Many angularjs fundamentalists have a negative attitude towards this. They b

: Network Disk DownloadContent Introduction······"Great Hotel""I am honored to be the technical reviewer of this excellent book. This book can help many intermediate Python programmers master This language, I also learned a lot of knowledge! "Member of the--alex Martelli,python Software Foundation"For intermediate and advanced Python programmers who want to expand their knowledge, this book is a treasure trove of practical programming skills. "--danie

line: Copy Code code as follows: [Root@ufo shellprogram]#./testexecutelog.sh 0 Msglog Execlog In the above shell script, num1 corresponds to a value of 0 logfile in the command line with a value of Msglog execlogfile execlog. The use of function setlogfile is setlogfile log file name, in the example using SetLogFile ${execlogfile}, in the function of exec 2>> $1;exec $ 1 redirects the standard output and the standard error output information to the Execlog file. Let's

be looked up in MSDN, createTextRange () returns a TextRange object, continues to consult TextRange object, found that there are many methods, first tried FindText method, found only text, can not select the object, continue to find, finally found Movetoelementtext is the way we are looking for: [Ctrl + A All SELECT Note: If the need to introduce external JS need to refresh to perform] Similar to such a problem, you can think of the past has been written to see similar

("select * from employee_table WHERE LASTNAME =?"); As with the Createstatement method, the purpose of the overloaded Preparestatement method is to provide support for the specified ResultSet feature. The Preparestatement method also has variants that can be used with automatically generated keys. Here are some examples of valid Preparestatement method calls: Example:preparestatement method Note: Please read the code example does not guarante

control, and so on. Integrated into the project from the Essex version.Measurement (metering): Ceilometer. Like a funnel, it collects almost all the events that occur within the OpenStack, and then provides data support for billing and monitoring and other services. Integrated into the project from the Havana version.Deployment Choreography (Orchestration): Heat[2]. Provides an automated deployment of cloud infrastructure software running environments (computing, storage, and network resources)

Mailpath Features are similar to mail. But you can use a group of files, separated by a colon, and each file can be followed by a question mark and a message sent to the user SHELL The path name of the shell TERM Terminal type Tmout Shell automatic exit time, in seconds, if set to 0 to prevent the shell automatically exit Prompt_command Specify commands to be executed before the main command prompt PS1

password, then no longer need to enter the password. Less to enter the SSH account password, is not more secure. PS2: again restrict IP access SSH, the server will be more secure.Vi/etc/hosts.allow Sshd:172.16.x.x:allow #在最后一行写入172.16.x.x/172.16.0 (paragraph)Vi/etc/hosts.deny Sshd:all PS3: Suppose you want to delete the public key, do not select the public key when connecting SECURECRT, and then enter the SSH configuration file to modify the following: 1. Annotation #authorizedkeysfile%h/.ssh/a

Server Once upon a time, the partners had a headache for the upgrade of the database. Often the upgrade of the program does not catch up with the upgrade of the database (version control is good, this may not be a problem, but for a large number of Chinese companies this is unavoidable). and some n-long ago databases to use new programs, Database upgrades are almost impossible. So the critical nature of the database upgrade is gradually protruding. for table and field upgrades are not difficul

jquery is a treasure trove, and the jquery plug-in system is an inexhaustible treasure, many developers in the jquery framework, the design of countless plug-ins, jquery's expertise is the Web page effect, therefore, its plug-in library is also more related to the UI. This is the best jQuery plug-in of the 2009 for the Webdesignledger.com website. La Yangcong In a fixed area, looping through several pieces of content, much like the old La Yangcong,

Operating Interface (Horizon) OpenStack Identity Certification (Keystone) OpenStack Network Service (neutron) OpenStack Block Storage (Cinder), providing block data access OpenStack Telemetry (ceilometer), providing metering and monitoring functions OpenStack Orchestration (Heat), provides automatic extension of virtual machine function OpenStack database Service (TROVE), which provides data management capabilities Two Installation tools Fuel Mirant

space. The first network of China's piano industry made out of sharp vision And some industry web site, the Starry Night Piano network of the piano network of the host Chen Nan, not a master of the network industry, at first the purpose of the site is mainly to the interest of piano music, to do a personal site is to better and the vast number of piano musicians to exchange learning. 1998, with outstanding results from the Zhaoqing Education College Music Education professional graduate Chen Na

move= ' MV ' Alias mv= ' Mv-i ' Alias pico= ' pico-w-Z ' Alias rm= ' Rm-i ' Alias Search= ' grep ' Alias v= ' VDir ' Alias vdir= '/bin/ls $LS _options--format=long ' Alias Which= ' Type-path ' Alias wtf= ' Watch-n 1 w-hs ' Alias Wth= ' Ps-uxa | More Problem thinking 1. How to cancel the alias designation. 2. Is the alias valid in the shell script? 3. How to list all aliases. 4. How to cancel all aliases. 5. How to execute the LS command itself, not alias. Related information "1" Linux

(ceilometer) monitoringDB Service (TROVE) database servicesProcessing (Sahara) data processing network extension complement map Although most environments include Identity, Image service, Compute, at least one networking service, and the dashboard, T He Object Storage service can operate independently. If Your use case only involves Object Storage, can skip to Object Storage service after configuring the appropriate No Des for it. However, the dashbo

treasure trove, many of my classmates, friends will be able to help me in the future. So the network education in my mind germination. The Chinese Education Station (www.eduz.cn) was born like this. Now I can not say that I have been very successful, but the current site has reached the desired effect, the development momentum is very hot, after all, education is very important for everyone, network education is a development trend of education netwo

xml| Data | database Extensible Markup Language (Xml,extensible Markup Language) is now becoming the preferred format for various data, especially documents. Because it has the ability to tag different fields (field), the search becomes simpler and more dynamic, making the files that the enterprise prepares to throw into the wastebasket into a treasure trove of data mining. XML frees the content from the presentation format so that the material can b

/lora_pkt_fwd/global_conf.json Example 1: Setting the cn470-510 80-87 Band { "Sx1301_conf": { "Lorawan_public": true, "CLKSRC": 1,/* Radio_1 provides clock to concentrator */ "Radio_0": { "Enable": true, "Type": "SX1255", "Freq": 486600000, .................................................... }, "Radio_1": { "Enable": true, "Type": "SX1255", "Freq": 487400000, .................................................... }, Figure 2-1 View cn470-510 80-87 Band: Head–n/global_conf.json Example 2: Setti

)Class.forName (String): Loads the class and performs class initialization; the second parameter can be Class.forName (string, Boolean, ClassLoader) to simply load a class without initializing;Classloader.loadclass (String): Loads the class only, does not perform class initialization;PS2: Sometimes you see this usage:Class.forName ("Com.mysql.jdbc.Driver"). newinstance ();This is not necessary, as described above, static initialization has been new to a driver object, register to DriverManager,