ps4 jrpg

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

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

("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

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

)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,

indicates the fourth version of the installation BeautifulSoup>>> from BS4 import beautifulsoup # import BeautifulSoup>>> soup = BeautifulSoup (' (HTML) (/html) ', ' lxml ')Why is BS4, because others write the module when the definition of a package is called PS4, show off the module. can go to the official website to view the source code4.pyquery Analytic LibraryPIP3 Install Pyquery>>> from pyquery import Pyquery as PQ>>> doc = PQ (' (HTML) Hello (/

Tags: Shell current directory interpretation. BASHRC represents the scheme IMA slash TPSDrop one first:How to make your LD terminal more personal? First of all, we need to understand the following points of knowledge.A: Configuration filePersonal configuration file:~/.BASHRCGlobal settings file:/ETC/BASH.BASHRC (Modify requires Administrator privileges)BThe command prompt is controlled by a special shell variable, namely: PS1,PS2,PS3,PS4.We can only c

1. Install the required packagessudo apt install apt-transport-https ca-certificates Software-properties-common Curl2. Add GPG key, and add Docker-ce software source, here is the DOCKER-CE source of China University of Science and technology as an exampleCurl-fssl HTTPS://MIRRORS.USTC.EDU.CN/DOCKER-CE/LINUX/UBUNTU/GPG | sudo apt-key add-sudo add-apt-repository "Deb [arch=amd64] https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu \$ (LSB_RELEASE-CS) stable "3. update package cache after adding suc