Linux

Application Environment Ubuntu1compilingquestion 1: configure:error: " Error:libcrypto required."Solution:apt-getinstall Libssl-devIssue 2:uint32_tdoes not name a typeSolve:uint32_t definition file in stdint.h, via whereis stdint.hStdint.h:

(1) Changing file or directory permissions: chmod{Ugoa} {+-=} {RWX}{mode=421}-R Recursive modificationYou can change multiple chmod g+w a.txt b.txt c.txt at the same timeExample: chmod g=rwx a.txtchmod 755 A.txt(2) Changing the file or directory

First, install the minicomUbuntu installation: sUdo Apt-get install minicom,CentOS Installation: Yum install minicomSecond, the configuration minicomUbuntu Input: sudo minicom-sCentOS Input: minicom-s # #进入配置界面 +-----[Configuration]

MountMount, by default the command outputs a list of devices mounted on the current system, as shown in:Show four part information:Device file name; mount point; File system type; Access status.Mount Command Demo:Format: mount-t type device

/root directory/bin storing the necessary commands/boot Store the kernel and the files required for the reboot/dev Store Hardware device files/etc Store System configuration fileHome directory for normal user/lib storing the necessary runtime

One day my Linux machine suddenly full of disk, using the DF command to view/DEV/SDA1 184G 184G 0 100%/View the size of each directory by using the command in the root directoryDu-h-X--max-depth=1, and found that all the directories added up to only

Explain:It's mostly a set of variables in bash, the name can't be customized, and the action is fixed.$?The last command executed returns a status of 0 for success, not 0 for failure$$Process number of the current process$!Process number of the last

1. New user SyntaxThe useradd option user name option means the following:-c comment Specifies an annotative description of the-D directory to specify the user Hu home directory, and if this directory does not exist, use-M can be used to create the

ObjectiveTo modify the unified system time as required by the project requirements the details are configured as follows:In CentOS 7 there is a command timedatectl can help us to modify the time zone of the server.1. Check the time settings in the

Linux PXE network installedFirst, PXE1. Case650) this.width=650; "src=" Https://s1.51cto.com/wyfs02/M01/9B/96/wKiom1lktQjyutkNAABXoesBS10998.png "title=" Picture 1.png "style=" Float:none; "alt=" Wkiom1lktqjyutknaabxoesbs10998.png "/>2. Case

Local variablesVarname=value scope for the entire bash processLocal variablesLocal Varname=value scope is the current code snippetEnvironment variablesExport Varname=value scope is the current shell process and its child processesPositional

The LS command is one of the most commonly used commands under Linux, LS is the same as the dir command under DOS, is used to list the files under the directory, let's take a look at the use of LSLs/home This command not only adds users to the

LS Primary knowledge LS lists the files and directories in the current directory Ls-f distinguishing between files and directories and executable files Ls-a to show hidden files together LS-R displays the files contained

People who have been working on the Linux command line for a long time may have a common view-"destroying the eyes" in the default black and white Front background color window operation, it is easy to cause visual fatigue. In time you are like ding

Tx1 linux built-in i2c Tool 1. I2c scan:The i2cdetect-l command can be used to view the I2C bus on TX1. The returned result shows that TX1 contains seven I2C buses.Ubuntu @ tegra-ubuntu:/proc/device-tree $ i2cdetect-lI2c-0 unknown Tegra I2C adapter

Java. lang. OutOfMemoryError: unable to create new native thread, createnativethread Symptom: SuperMap iServer is deployed in Tomcat (8.5.13), and the number of concurrent users is around 100. After the system runs for a period of time, the Service

Rsync installation and configuration, rsync installation Configuration Server Configuration Installation Server Step 1: Download the rsync installation package (online or offline)Wget https://download.samba.org/pub/rsync/rsync-3.1.2.tar.gzTar-xzf

Assignments for the first week of Python automated development and learning --- Level 3 menu, Job Requirements:(1) run the program to output the first menu(2) Select a level-1 menu and output level-2 menus. Similarly, level-3 menus are output.(3)

After a linux Server hacker intrusion, after a linux ServerScenario: The centos server ssh is unavailable on Monday, and applications such as web and database do not respond. Fortunately, vnc can log on and use the last command to query. The logon

The CentOS7 Nic cannot be started. This problem occurs in Linux. The NIC of centOS7 cannot be started, and thus the cluster cannot be created. If there is no IP address for the ifconf-env33 Nic See the figure below.   If you meet me, hehao,