Linux

Summary:Details the process of automatically backing up the database under Windows and Linux , and hopefully let the novice get started now!The content of this document is divided into 2 parts:linux and windowsLinux and Windows are divided into:

?? 1, crontab?? (1) crontab run every 10 seconds? * * * * * */bin/date >>/tmp/date.txt?* * * * * * sleep/bin/date >>/tmp/date.txt? (2) can also be expressed in the following ways? String???????????? Meaning??------??????????? -----

Linux system has a performance problem, generally we can use Top.iostat,vmstat and other commands to view the initial location problem. 1. Top top - 16:50:36 up 1 day,   4:59,  2 users,  load average: 0.06, 0.08, 0.08tasks:  159 total,   1 running, 1

Each character device in the kernel corresponds to a variable of the CDEV structure, and the following is its definition: Linux-2.6.22/include/linux/cdev.hstruct Cdev {struct Kobject kobj; Each cdev is a kobjectstruct module *owner; Point to the

1. Basic Permissions(1). Character notationR: Read permission, for the file, is to have greedy to look at the content of the file permissions, and for the directory, it means you can view the name of the sub-object under the directory;W: Write

Disk Management---File system detection and interchange partition(i) File system detectionfsck--check and fix Linux file system errors.When to use?This command is usually used only if it is root and the file system has a problem. Do not use this

The purpose of this article is to record the commands of running jetty under common Linux environment, which can be applied to other web containersIf the server is not set Java_home, you can manually set the edit startup.shIn the first line, note

Shutdown-h now shuts down the computer immediately reboot restart the computer now Shutdown-r Logout Log Outgetconf long_bit echo $HOSTTYPE uname-a The top three are looking at the number of computer bitsDeleteRM a.txt Delete normal file a.txtrm-

Summary four: Linux time-related common commands1. Date command-show time or set timeUsage (1): date [options] ... [+format] Display+%f,+%d Show Date+%t Show Time+%y years+%m Month+%d Day+%h when+%m points+%s seconds+%u Week+%s time stamp timing,

This article describes the whole basic: http://www.2cto.com/os/201308/238733.htmlA few simple memos:1. Ubuntu can be installed under Apt-get;2. configuration file/etc/rsync.conf Default does not exist, need to create manually;3. Ability to activate

Some basic concepts of memory management:Address1) Logical address: Refers to the part of the offset address generated by the program related to the segment. In the C language pointer, read the pointer variable itself value (& operation), which is

Tag:linux    signal set     #include #include #include #include #include #include /*sigemptyset (&newmask);//Get an empty shielded signal set Sigfillset (&newmask);// Gets the masked signal set that masks all signals, except for the two

Linux Backup Tools GNU's traditional backup tool GNU tar-http://www.gnu.org/software/tar/ GNU cpio-http://www.gnu.org/software/cpio/ GNU CP and DD (coreutils package) ––http://www.gnu.org/software/coreutils/ improvements,

To download the source of LS as an example, explain:The first thing to know is which package LS belongs to, you can use the following command:#dpkg-S ' command name ' common format $ dpkg-s/bin/lsThe following results are obtained:

common tools for Linux system monitoring I. System core Toolkit (COREUTILS)1./BIN/DF report The disk space usage of the system df-h display the disk partition fdisk-l2./bin/uname Display System Information UNAME-SRVMOTwo. System Process Toolkit

1 #defineMax_interface 642 3 intshowifs ()4 {5 inti;6 intRC;7 intsock;8 intIfnum;9 structifreq Ifr[max_interface];Ten //struct arpreq arp; One structifconf IFC; A -Sock =sockets (Af_inet, SOCK_DGRAM, ipproto_udp); -

1. Whether the query is installedNTP, install with Yum if not installedRpm-q NTPYum–y Install NTP2. Server-side configurationThe server side needs to modify the configuration file/etc/ntp.confVi/etc/ntp.conf2.1 Clock with Internet time server for

To create a process:Linux creates two steps of new processing: fork () and exec (). Where fork creates a copy of the current process's ability (parent process), that child. The parent-child process has only different PID. After this, the system has

Linux ifconfig command to configure IP address, linuxifconfigNic naming rules in Linux: eth0 and eth1. The first Ethernet Card and the second card. Lo is the loopback interface, its IP address is fixed to 127.0.0.1, And the mask is 8 bits. It

AIXStudy-AIX user resource access restriction Configuration AIX Study-AIX user access system resource limit Configuration The system resource limits used by Aix users include hard limits and soft limits ). Hard limits has been introduced since Aix 4.