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ls command is the most commonly used command under linux. ls command is the abbreviation of list. By default, ls is used to print the list of the current directory. If ls specifies another directory, the list of files and folders in the specified directory will be displayed. With the ls} command, you can view not only the files contained in the ...

Flume introduction 1. Flume 1. flume is a distributed, reliable and highly available system for massive log collection, aggregation and transmission. Support customization of various data senders in the log system for data collection; At the same time, flume provides the ability to simply process data and write to various data recipien ...

websocket background 1.websocket protocol was born after HTTP protocol. Before the emergence of websocket protocol, it was found that creating web applications that require two-way communication between the client and the server (for example, instant messaging and game applications) needed to abuse HTTP to poll the server for updates, which wo ...

Linux environment variables and process address space //View process pid and parent process [dy@VM-12-10-centos jincheng_12_5]$ ps ajx | head -1 && ps axj | grep 3669470 PPID PID PGID SID TTY TPGID STAT UID TIME COMMAND 3669469 3669470 3669470 3669439 pts/0 3681645 S 1001 0:00 -bash 3669470 3681645 368 ...

http protocol 1. Introduction to http http protocol is called hypertext transfer protocol. Hypertext: not only text, but also pictures, audio, video, etc.Transmission: it is based on TCP/IP. Please transmit with a response mode.Protocol: connectionless and stateless application layer protocol. 2. Working principle http protocol works on b/ ...

1. Under linux environment 1.1 introduction to related functions In Linux environment, < dirent h> Is an application program interface, which is mainly used for directory reading operation of file system, and provides several directory data reading functions. Under Linux, all file name information can be obtained by traversing the fold ...

1, Test task     The principle of using Capability to achieve minimum permission is used, and the design of access control based on Capability in Linux is analyzed 2, Experimental preparation   Download Libcap    libcap   Libraries enable user level programs and   capability   Some linux distributions ...

About command > / dev / null 2 > & 1 The program will process the external input, and then output the result of the operation to the specified location. For common background programs, the input may come from external files, and the operation results are also written to other files. In interactive programs (such as bash interacting ...

Reference link: Vmware Ubuntu kylin NAT mode Internet access settings_ Y4ung CSDN blog Ubuntu 16.04 pure version - install Python 3.8.1/upgrade pip - Wang Yu - blog Park (cnblogs.com) Ubuntu Python 3 PIP reports an error syntax error: invalid syntax_ Crabapple flower sleepless blog - CSDN blog The virtual machine installation will not ...

Before installation, please explain a few points. Because you are not familiar with the installation method of linux, you can see that there are many installation methods, including source code compilation, dpkg, apt, etc. we all know the source code method here, compile through Makefile or cmake, and then install. The process is complex and er ...