Linux

groupadd 创建新的用户名Syntax format: groupadd "option" "Group" groupadd [options] [user Group]NOTE: The ID command and subsequent options and user groups must have at least one space between each elementDescription: The Groupadd command is generally of

To monitor and control the process, you must first understand the current process, that is, to view the current process, the PS command is the most basic process to view the command. Use this command to determine which processes are running and

Processing of instructionsIn the CPU, the processing of instructions is generally divided into:1. Take the instruction stageThe fetch instruction (instruction Fetch,if) stage is the process of taking an instruction from main memory to the

1, create/testdir/dir1/x,/testdir/dir1/y,/testdir/dir1/x/a,/testdir/dir1/x/b,/testdir/dir1/y/a,/testdir/dir1/y/b2, create/testdir/dir2/x,/testdir/dir2/y,/testdir/dir2/x/a,/testdir/dir2/x/b3,

1. Working with directory common commands LS: List directory CD: Switch directories PWD: Displays the current directory mkdir: Create a new directory RmDir: Delete an empty directory CP: Copying Files or directories RM:

Lottery Project Deployment Documentation: 1, draw project using Python3 development, Python version 3.x can need to install Python third-party module PIP install django==1.9.0 This must be added version number pip install Pillowpip Install

Today intends to compile support Orange PI Development Board Raspbain Jessie System from GitHub to take the source, download, compile, has been relatively smoothThe result is half-compiled with an error:206:/bin/sleepfile: Exec format errorBased on

1. View the available JDK versionsAfter the login server is successful, enter the following command to view the supported JDK versionsYum-y List java*Because the server version is 64-bit, I would like to install 1.8 jdk, so select the marked version,

one, single-character said:1. Specific characters: a specific character.' 1 '' A '' \. '2. Single character within range: single character [][0-9][259][A-z][ABC][A-z][ABC][A-za-z] [,:/] [.]character inversion:[^0-9][^123]3. Any character:. The

Yesterday watching the video, found in Linux under the new hundreds of, thousands, tens of thousands of files, the implementation is too simple.Use command for:[email protected]~# touch wang{1..10000}?????????????????? Batch build 10,000 files,

Build the Java environment before you install Tomcat Download JDK http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html from official website first Then put the downloaded

Scp-r-P 22/srv/ox/demo [email protected]:/home/ps/Local demo directory file upload to PSCp-r/home/ps/demo srv/ox/copy functionNew file:Touch setenv.shNew folder:mkdir setenvUnzip the file to /usr/local2, in the /usr/local file directory unzip

Environment variable configuration:Vim/etc/profile Add the following configurationJava_home=/home/java/jdk1.8.0_101Jre_home==/home/java/jdk1.8.0_101/jrePath= $PATH: $JAVA _home/bin: $JRE _home/binClasspath=.: $JAVA _home/lib/dt.jar: $JAVA

The completion of Linux kernel synchronization mechanismA common pattern in kernel programming is to initialize an activity outside the current thread, and then wait for the activity to end. The activity might be to create a new kernel thread or a

One, two stages of user space I/O operation1, waiting for the data preparation phaseThis phase is primarily to load the data into kernel space (memory buffers) first2. The phase of data copying from the kernel to the processThis phase is primarily

The command is: Tail-f catalina.outTail commandUseWrites the file to standard output, starting at the specified point. Using the-f option of the tail command makes it easy to see the log files that are being changed, TAIL-F filename will display the

transferred from: 8066321This is always a problem, especially some of the first rookie, will say how I have updated no way!!!! In fact, we can take care of it, and when we are quiet, you use the service Tomcat Stop service Tomcat Strat service

1. View the Tomcat processExecute the command $ps-ef|grep Tomcat you will be able to figure out the process number that Tomcat occupies, which, of course, requires Tomcat to boot.# Ps-ef | grep TomcatRoot 4637 1 0 Aug08? 00:02:01/opt/ibm/java-x86_64-

Open TerminalCd/java/tomcat#执行Bin/startup.sh #启动tomcatBin/shutdown.sh #停止tomcatTail-f Logs/catalina.out #看tomcat的控制台输出;#看是否已经有tomcat在运行了Ps-ef |grep Tomcat#如果有, use kill;Kill-9 pid #pid for the corresponding process numberFor example Pe-ef |grep

One, dd command: 1, can copy files, 2, can make iOS image, simple understanding is backupCommon parameters if setting the name of the input fileof setting the name of the output fileBS setting each "block" sizeCount to copy the number of