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I Format of shell script file shell script file generally consists of three parts: interpreter, command code and comments. [root@server ~]# cat test #!/bin/bash <<notes Here are multiline comments notes echo 'hello world' # Here is a single line comment echo valar morghulis [root@server ~]# sh test hello world valar morghulis The fi ...

1. ls command It is the abbreviation of list. Through ls command, you can not only view the files contained in the linux folder, but also view the file permissions (including directory, folder and file permissions) View directory information, etc. ls -a List all files in the directory, including.Start hidden file ls -A List Division.an ...

(1) Preparation: Linux uses CentOS-7-x86 Official website download address: https://archive.kernel.org/centos-vault/7.6.1810/isos/x86_64/ Virtual machine VMware Workstation 16 Pro I know everything on this website Hadoop installation package version: hadoop-2.7.4 Official website download address: https://archive.apache.org/dist/hadoop/co ...

prefaceOur applications are generally deployed on Linux, so we have to learn linux commands to solve problems. According to experience, commonly used commands are basically used again before forgetting, so it's natural to remember. Occasionally used commands still have an impression when they are used next time. They can be remembered after sev ...

Apache server Overview - Installation Apache server Overview - Installation WEB server, also known as WWW(WORLD WIDE WEB) server, is mainly used to provide online information browsing Service. Common web servers: httpd(Apache),nginx+PHP Tomcat: jsp + html win:IIS Client: IE, firefox, chrome, mobile (Browser) Browser Today's protagonist: L ...

catalogue 1, Operation mode of QEMU 2, QEMU executes programs in user mode 3, System mode usage of QEMU 1, Operation mode of QEMU He directly excerpted his "uncover home router 0day vulnerability mining technology", checked it online and found no satisfactory QEMU instructions, so he adopted the introduction in this book. If you ...

Condition variables are used to synchronize threads. How to synchronize? Let's look down Conditional variable correlation function #include <pthread.h> int pthread_cond_init(pthread_cond_t* cond, const pthread_condattr_t* condattr); //Initialize condition variable int pthread_cond_destroy(pthread_cond_t* cond); //Destroy condition var ...

Problem attractor stackoverflow There is this problem. The standard says that the variable parameters of makecontext must be of type int, and then find the variable parameters of makecontext Source code There is a note in the following paragraph. /* Handle arguments.         The standard says the parameters must all be int values. This is ...

Preface: The nature and working mode of library files in both Linux and Windows are the same, except that the corresponding file formats and file suffixes for libraries on different platforms are different. The library called in the program is a static library. There are two purposes to use libraries in a project. One is to make the program si ...

1. Process 1.1 ps command There are many options for this command, so let's pick some common combinations to record. 1.1.1 ps aux List processes executing in the system [root@localhost sbin]# ps aux USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 2 0.0 0.0 0 0 ? S 01:09 0:00 [k ...