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How to intercept strings in shell
By using variables and string interception operators, cut command, awk command and sed command, you can easily intercept and process strings. These methods are very useful in shell scripts and can help us achieve various string manipulation and processing tasks.
Strengthen your Linux server security: Become proficient with these commandsEnhance the security of your Linux server: Use these commands proficiently In the current Internet era, servers are important infrastructure that many businesses and individuals rely on. In order to ensure the security of the server, we need to take a series of measures. In addition to configuring firewalls, updating operating systems and software, and using secure passwords, mastering some common commands can also help us monitor and protect servers. This article will introduce some commonly used Linux commands to help you enhance the security of your Linux server. Check the login log. The login log is the server.
How to print pid, info, children and destroy process in JShell of Java 9?JShell is a JavaShell tool used to execute simple java statements, such as classes, methods, interfaces, enumerations, etc. Evaluate it and print the results to the command line prompt. Java improves ProcessAPI to manage and control operating system processes. The ProcessHandle interface identifies and provides methods for controlling native processes, checking process activity, and destroying processes. The ProcessHandle.Info interface provides an information snapshot of the process. In the following code snippet, we can print the pid process API.inJShell tool. Code snippet jshell>ProcessHandlecurrentPro
How can we customize how JShell is launched in Java 9?JShell is an interactive REPL tool for executing and evaluating simple Java programs such as variable declarations, statements, expressions, etc. When the JShell tool starts, the code is preloaded by default. To display this code we simply start the command "/list-start". You can ask JShell to automatically load them on startup using the following command: "/setstart[-retain][Type]". The first option "-retain" tells JShell to record the [Type] required for the next JShell session to start. If we do not specify, the default startup can be started when opening a new session /setstart[-ret
How to implement a map in JShell in Java 9?JShell is a javashell tool introduced in Java9. It is an interactive tool that can read input, execute it, and print it in the command line prompt. We don't need to write main() method like Java class to execute it. We can implement different collections including set, list and map. The important collection is the Map interface, which is a key-value pair. The map contains no duplicate keys, and each key maps to at most one value. In the following example, we can implement a non-null mapping. C:\Users\User>jshell|WelcometoJShell--Version9.0.4|Foranintroduc
How to run MongoDB shell using mongos command?In order to start the MongoDB shell, you need to use the mongo command. Following is the syntax ->mongo First go to the MongoDBbin directory from the command prompt as shown in the image below - This is the command to start the mongoshell as shown in the screenshot below - This will produce the following output -
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