Linux Common Commands-mkdir

The Linux mkdir command is used to create a directory of the specified name, requiring the user who created the directory to have write permissions in the current directory, and the specified directory name cannot be a directory that is already in

Linux server I/O read-write test

How Linux tests IO performance (disk read/write speed)These days to do the MySQL performance test, a huge company, find a few performance testing machines are very tangled, finally coordinated to two, IO performance is not known.The database is an

Linux One small step per day---The alias command detailed

1 command functions The alias command is used to set an alias for an instruction, and aliases set by the alias command are limited to the login operation, and an alias can be set in/etc/profile or in your own ~/.BASHRC if you want to automatically

Linux timed Tasks crontab detailed

Original address:http://edu.codepub.com/2011/0104/28518.php Today I made a backup script of the database, and by the way the system had to learn the settings of the timed execution script under Linux. Linux scheduled execution is mainly used in the

Linux copies all files in the specified directory to another directory

Linux copies all files in the specified directory to another directoryCopy all files in the specified directory to another directoryThe copying of files and directories is often used. The commands for copying under Linux are CP.Assume that the

The LS command and the CD command of the Linux command

Ls- L : Long Format File type: the              - : Normal file (f)D: Catalog FilesB: block device files (blocks)C: character device files (character)L: Symbolic Link file (symbolic Linkfile)P: command Pipe file (pipe)S: socket file (socket) File

Linux view some commands for system information and the commands to view installed packages

System# uname-a # View kernel/Os/cpu info # head-n 1/etc/issue # view OS version # Cat/proc/cpuinfo # View CPU Info # hostname # View Meter Computer name # LSPCI-TV # List all PCI devices # LSUSB-TV

Linux int Max is how big

can view/usr/include/limits.h fileIt defines the maximum and minimum values for each type..../* Minimum and maximum values a ' signed int ' can hold. */#  define int_min   (-int_max-1)                                                                  

Linux basic commands

Here we introduce the common Basic command one, log off shutdown restart logoff system logout Command 1Logout logoff is the relative operation of the landing system to leave the system users as long as the direct release of the logout command:

Use SSH public key to automatically log into Linux server

As a Linux administrator, logging on to multiple Linux servers for remote operations is part of the daily work. But with the increase of the server, each login, the system will prompt to enter the user name and password, frequent input user name and

COMPUTE command collation under Linux

In the Linux system, there are often some computing needs, then the following simple comb the next few commonly used calculation commands(1) BC commandThe BC command is a calculator language that supports interactive execution of arbitrary precision.

The use of Linux composer

The installed composer is easy to use, with two-step loading of componentsCases1. Search component: Composer Search Phpexcel2. Download component: Composer require manufacturer name/package nameThen, in the script that uses the plug-in,

Readable, writable, executable permission interpretation and usage of CHMOD,CHOWN,CHGRP commands for Linux files

I. Interpretation of file permissionsAs shown, the beginning of the-rwxrw-r--string identifies the file permissions.This string has 10 bits, which can be divided into 4 segments to interpret. Note: r--readable, w--writable, x--executable.The first

DHCPD Command--linux command application of large dictionary 729 commands interpretation

The content originates from the people's post and Telecommunications press "Linux command Application big dictionary"tell 729 commands, 1935 examplesLearn about the Linux system's reference books, desk book, encountered the command or command not

Dealing with leap seconds under Linux

Article LuxianghaoArticle Source: http://www.cnblogs.com/luxianghao/p/6339470.html reprint Please specify, thank you for your cooperation.Disclaimer: The content of the article represents only personal opinions, if not, please correct me.---Why do

Linux-top the meaning of each field after the command output

The top command is a common performance analysis tool under Linux that shows the resource usage of individual processes in the system in real time, similar to the Task Manager for Windows. Here is a detailed description of how it is used. Top is a

Linux Learning--copy file

1. local Copy FileCP [option] source file destination file-A as far as possible file status, permissions and other information are reproduced as original.-R If the source contains a directory name, the files under the directory are also copied to

Linux fork () function reprint ~ ~ ~

Transfer from:: http://blog.csdn.net/jason314/article/details/5640969First, Fork Introduction knowledgeA process, including code, data, and resources assigned to the process. The fork () function creates a process that is almost identical to the

16 Practical Linux/unix Tape Management commands

In this tutorial you will learn:· Tape Device Name· Basic commands for managing tape drives· Basic Backup and Restore commandsWhy backup?A backup plan is necessary for regular backup files, and if you prefer not to back up, the risk of losing

"Linux" xshell-linux common commands

(1) Command ls--list filesLs-la gives a long list of all the files in the current directory, including a "hidden" file that begins with a periodLS A * lists all files in the current directory that begin with the letter ALs-l *.doc gives all files

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