Linux view CPU and memory usage

During system maintenance, it may be necessary to review the CPU usage at any time, and to analyze the system condition according to the corresponding information. In CentOS, you can view CPU usage by using the top command. After running the top

Linux View CPU count, number of cores, logical CPU number

Physical CPU: The physical CPU is relative to the virtual CPU concept, refers to the actual existence of the processor, is that we can see, the touch of the CPU, is inserted in the motherboard above.Physical Core: The number of physical cores that

Linux interprocess communication Pipeline (pipe), named pipe (FIFO) and signal (Signal)

Organize from the networkUnix IPC includes: piping (pipe), named pipe (FIFO) and signal (Signal)Piping (pipe)Pipelines can be used for communication between affinity processes, and well-known pipelines overcome the limitations of pipe without name,

Linux common commands (echo, date, LS, CD, history, CAT)

I. Linux common commands There are a lot of today we'll summarize the common entry commands:1.linux Shimonoseki command: Poweroff, init 0, Halt, Shutdown-h now2.linux Restart command: Reboot, init 6, Shutdown-r now3.shutdown command:Format: Shutdown

88 Linux System Administrator-required monitoring tools

With the continuous development of the Internet industry, a variety of monitoring tools are countless. Here is a list of the most complete monitoring tools on the Web. So you can have more than 80 ways to manage your machine. In this article, we

Linux operation Tip: "Can ' t open file for writing" or "Operation not permitted" workaround

The use of the VI command on Linux to modify a file content, found unable to save, each time after the use of ": q!" command can exit normally but use ": wq!" command to save the file and exit when the message appears:E212:can ' t open file for

Linux folder and file creation Delete command

Linux Delete Folder commandLinux Delete directory is very simple, many people are still accustomed to use rmdir, but once the directory is not empty, it fell into deep distress, now use the RM-RF command.Direct RM is available, but add two

Ways to get random numbers from Linux

The method of 1.1.1 Inux random number one. [[Email protected] ~]# date +%n%N nanoseconds randomly acquired nine-digit pass time823015723Get random numbers by time (date)Date +%s%n #生成19位数字, 12877648070

Different--diff commands for comparing two text files under Linux

Features of the 1>diff commandThe function of the diff command in Linux is to compare two text files on a line-by-row basis, listing their differences. It checks the given file for a system and displays all the different rows in the two files

Identify partition file system types under Linux

File systems mounted under Linux sometimes need to fill in the file system. But some devices get hands still do not know the file system, this situation, can be usedparted command# parted/dev/Vdagnu Parted3.2Using/dev/vdawelcome to GNU Parted! Type'

The DNS request process and resource record definition for---------Linux

DNS type/synchronization type/domain and region differencesSOA internal Data characteristicsImplementation of DNS load balancing (load balance)Caching DNS serversCache definition, action, multilevel cachingA full parse requestResolve the answerDNS

The use of the SED tool---------Linux

Sed stream editor, line editorhow SED works650) this.width=650; "src=" Https:// "title=" Qq20170910181051.png "alt=" Wkiom1m1d9fhb8yhaabo5xoq2ai293.png "/>650) this.width=650; "src="

Introduction to Jiffies and its functions in Linux kernel and a detailed description of jiffies and other related functions

Two global variables involved in Linux clock interrupts one is xtime, it is the TIMEVAL data structure variable, the other is the jiffies, first of all, look at the timeval structurestruct Timeval{time_t tv_sec; /***second***/susecond_t

Linux Lesson Two

Wildcard characters for file names:[0-9]\[a-z]\[[:d Igit:]]\[[:alpha:]]\[[:alnum]]\[[:upper:]]\[[:lower:]]\[[:black:]]Rename renaming# Rename. txt. xsl/appTreeView Structure-d-lTr# ifconfig eth0 |tr A-Z A->ip.txt you can save by converting and

Linux basic commands

1. Modify the host name:# hostname vi/etc/sysconfig/network2. Turn off the mail feature of the Linux system automatically prompt:echo "unset mailcheck" >>/etc/profile3.ssh Password-Free login user home directory:CD.

Linux Security baselines

1. Physical protectionBIOS setup PasswordBoot grub.conf Add password2. System installation is minimized and only base services are installed3. Application data partitioning and system isolation4. Disable boot-up services that do not need to start5.

Command tips for Linux learning notes, bash-supported quotes and file wildcard characters

Command tips:Tips for command exercise:Ctrl + A cursor jumps to the topCtrl + e cursor jumps to the end of a career CTRL + u delete the cursor to the beginning of the contentCtrl + k Delete cursor to end of line contentCtrl + L for clear

Linux Command background run

Reference textThere are two ways of doing this:1. Command &: Background run, you shut down the terminal will stop running2. Nohup Command &: Run in the background, you will continue to run the terminalFirst, IntroductionLinux/unix the biggest

Linux Time functions

System Environment: ubuntu10.041. Common time types under Linuxtime_t, struct TM, struct timeval, struct TIMESPEC1.1 time_t Time TypeThe time_t type is defined in Time.h:typedef long time_t;Visible, time_t is actually a long integer type. Its value

"Linux" FTP Active Passive mode

LNMP build the server, in the use of FTP, reported the following error: After checking, is the FTP active mode passive mode problemTool: XFTP5, remove the passive mode (other clients can check the corresponding passive mode to the active mode

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