Linux

"Copyright Notice: respect for the original, reproduced please retain the source: blog.csdn.net/shallnet, the article only for learning Exchange, do not use for commercial purposes"Just like in C, there are some errors in writing all the language

Fragmentation and reassembly of packets is one of the most important tasks in IP protocol.The IPV4 header has a Len field (used to represent the total length of the message, in bytes) of 16bit, so the maximum size of the packet is defined as 64K, (2^

When working with such problems, the server needs to switch from root to PostgreSQL to install the user to start the PostgreSQL service.The switch user and start PostgreSQL commands are as follows:# Switch to Pgsql user su postgres# starting Pg_ctl

Basic concepts of documentationFileObjects that can be read and writtenHave a certain right attribute, including access rights, types, etc.File systemA collection of files and their attributes, providing a naming and management mechanismFile

Sed, the abbreviation of Stream EDitor , is a Common text Processing tool in the Linux operating system, and can be easily processed by combining regular expressions with simple and convenient text. This article introduces the basic usage of SED

The configuration mechanism of Linux kernel and its compiling processFirst day of the country embedded in the third section: the configuration of the kernel on the X86 platform, the installation process, the production of their own Linux system, and

1. Installation RRDtool ErrorPerl:warning:Falling back-to-the-standard locale ("C")Workaround VI/ROOT/.BASHRCAnd then the bottom plusExport Lc_all=cor run directlyecho "Export lc_all=c language=en_us:en" >>/ROOT/.BASHRCAnd then execute

"Copyright Notice: respect for the original, reproduced please retain the source: blog.csdn.net/shallnet, the article only for learning Exchange, do not use for commercial purposes"like high-level languages, assembly language may write the same

Variable Operation Summary:${var:-value} variable Var is unset or null to output Value. A value that outputs the var value of the variable.${var:=value} variable var is unset or null to output value and is assigned to variable var.

192.168.1.11 is server1,192.168.1.22 is server2. "1" Installation inotify-tools   major Linux distributions have inotify-tools software package, recommended by Yum installation:   [[email protected]  ~] #yum  install inotify-tools  [[email protected]

DF DF (disk free)function Description:Displays information about the disk.Syntax:DF [-ahhiklmpt][--block-size=][-t ][-x ][--help][--no-sync][--sync][-- version][file or device]Additional notes:DF Displays the disk's file system and usage

Dedicated to knowing Mono, knowing Jexus, and interested in. NET mashup technology.The Linux directory tree is as follows:Detailed:/bin: The system has a lot of directories to place the execution files, but the/bin is quite special. Because the/bin

Mail alert mechanism in LinuxThe alarm mechanism in Linux is a key part of operation and maintenance management. We generally detect problems through monitoring, common monitoring software such as: Zabbix is now in use and ready to use. If we do

How to view cpu, memory, hard disk, and other hardware information in linux Note: in Linux, you can view detailed information about each cpu in/proc/cpuinfo. However, for dual-core CPUs, two CPUs are displayed in cpuinfo. It is often mistaken for

Configure the mail sending function in linux1. mutt + msmtp installation by default, smokeping sends an email using sendmail, but sendmail configuration is really not a common problem, and it is not necessary, completely useless, so I want to use

View User Logon records in Linux and user logon records in linux User logon information is recorded in utmp (/var/run/utmp), wtmp (/var/log/wtmp), and btmp (/var/log/btmp) and lastlog (/var/log/lastlog) files. Commands such as who, w, and users

Debian 7.7 entry-level installation and configuration Recently, multiple Linux versions have been installed, including Ubuntu, Fedora, CentOS, and Debian. We found that only Debian has the best performance in terms of interface and stability, and I

Btrfs file system repair skills Btrfs File System Tools gradually mature with the kernel version advances, but it is inevitable that there will be some accidents in the use process. What should I do if the mounting fails? If other file systems are

The Atom editor in Linux does not support Chinese solutions. Today I encountered an annoying problem: Today, Elementary OS (A Ubuntu-based Linux operating system) has been installed. After the sogou input method is installed, almost all the

How to Use the command line tool in Linux to manage the KVM Virtual Environment In the fourth part of our KVM series, we will discuss how to manage the KVM environment on the command line interface. We use the 'virt-install' and virsh command line