Linux

types of variables for LinuxAccording to the lifetime of the variables, the Linux variables can be divided into two categories:1 Permanent: The configuration file needs to be modified, and the variable will take effect permanently.2 Temporary: With

7 Types of operating level0: Indicates shutdown1: Single-user mode (no GUI can only log on with root)2And3: Basically the same (multi-user mode with no graphical interface)2 and 3 Difference 2 is no NFS function (a network share is not recommended

1.Linux System setup Optimization, vi/etc/sysctl.conf, add the following contentsysctl.conf Code Fs.file-max = 65535 Kernel.pid_max = 65536 Net.ipv4.tcp_syncookies = 1 Net.ipv4.tcp_synack_retries = 2 Net.ipv4.tcp_syn_retries = 2 Net.

Search features when the Find command does not add-nameMany documents that introduce the Find command do not describe the search feature without-name, as summarized below1, contain * and other meta-characters, search words do not add "" or "2,

Create a hard diskcd/dev/Fdisk-l: Viewing the capacity of a disk partitionFdisk-l/dev/sda/: View the capacity of the first SCSI hard disk partitionFdisk-l/dev/hdb/: View the capacity of the second IDE hard disk partitionMan fdiskll/proc/: Storage

August 4, 20151, download Ultiso software, register2, DVD1 the one dragged in3, "must double-click that go in" to "write hard disk image", otherwise only "write", or an ISO file, not the extracted files.4, covering the corresponding file Vesamenu.c32

A few days ago a friend to interview, got a Linux OPS interview, not too full, the database did not get, some did not answer, welcome the big God to add1. write a minimum of four Linux distributionsRedhat,centos, SuSE, Ubuntu, Debian,

Linux provides a mechanism for signaling process messages, what is a signal? It is a very short message, short to just one number. It is worth emphasizing that the signal and semaphore are only one word short, but they are completely different

1, the first time to write a blog, this afternoon struggled for an afternoon, finally understand how to connect the virtual machine above the Linux system.2, how to connect the system and configuration, I do not say, there is a

IDT: The Interrupt Descriptor Descriptor (Interrupt descriptor Table,idt) links each exception or interrupt vector separately to their process.GDT: Global descriptor for the intel® x86 series processor 80286, in order to define the characteristics

Linux on the concurrency network is divided into the Apache model (process per Connection) and TPC, as well as the Select model, and the poll model (typically the Epoll model)The Select model is extremely useful: This article is very good, there is

Simply enter the information in the/ETC/MOTD file and use tools such as putty/securecrt/ssh to log on to the system without restarting the server to display, WYSIWYG. We can even draw a character, as follows:OtherOnline said modify/etc/issue

Linux learning-ps aux command, linux-psaux command If you use the ps command directly, the status of all processes is displayed. Generally, you can use the grep command to view the status of a process. If you want to monitor the process time, use

Install the FTP server and configuration in Linux, and use linuxftp Generally, code and files are uploaded to the server, and vsftp is used a lot. The following describes how to install the configuration.Linux: centos6.6.Installation Steps 1.

Macro definitions of offsetof and container_of in linux, linuxoffsetof Macro definitions of offsetof and container_of in Linux Kernel # Define offsetof (TYPE, MEMBER) (size_t) & (TYPE *) 0)-> MEMBER) /**Offsetof meaning: Get the memory location

Linux-psaux commands If you use the ps command directly, the status of all processes is displayed. Generally, you can use the grep command to view the status of a process. If you want to monitor the process time, use the top tool. The following

Samba configuration process in Linux1. What is Samba? Samba is a set of software packages that allow Linux to support the SMB protocol. Samba is a set of software that allows Linux systems to Apply Microsoft network communication protocols. It

Install and configure the FTP server in Linux Generally, code and files are uploaded to the server, and vsftp is used a lot. The following describes how to install the configuration.Linux: centos6.6.Installation Steps1. Install vsftpd using

Shell tips-use "$" and "$0" to prevent multiple startup times of the same script When you write a shell script to start a scheduled task through crontab, if the shell script execution time exceeds, crontab pulls up the script interval, in this case,

Generate a public key private key using OpenSSL OpenSSL and Linux are used. Common commands are as follows: -- Generate RSA private key (in traditional format) Openssl genrsa-out rsa_private_key.pem 1024 -- Convert the private key in the