Linux

User CategoryPoints by Location: Local account, remote accountby function: Normal user, Superuser (root)Normal User:(1) system User:UID 1-499(2) Local Users:UIDEach user has a user group with the same name.User, group configuration file:User User

all files in LinuxFile type: theGeneral Documents -Catalog file dLink file LBlock device B (operations in blocks, such as hard disks)Character Device C (operates in characters, such as main memory)Socket s (Network communication device)Pipe PUbuntu

LsFunction: View the files in the directoryFormat: direct ls view current directory, or ls parameter / directory nameParameters:- l View details-A show hidden files. represents the current directory.. Parent Directory-G uses different colors to

The virtual machine in use, after replication, found that the network card name has changed, the correct method is as follows:For example, Eth0 became eth1:IfconfigUdev dynamic management device files:Cat/etc/udev/rules.d/70-persistent-net.rulesUdev

Linux virtual machine extension root partition!Virtual machine root partition space is not enough, in the virtual machine management interface for a single disk expansion (graphical interface operation slightly), such as the original 30G, extended

1. if want to let terminal login prompt character, become oneself like appearance, should change/etc/issue;2, if you want to let users login, only display welcome information, should be changed/ETC/MOTD;3, the hypothesis has three, namely: Command1 &

Timed execution of commands:[[email protected] ~]# at now + 1 minute //one minute to perform the following tasks at> date >>/tmp/test_date.log Timed Script Execution:[[email protected] ~]# at now + 1 minuteat>/root/test.shat> job 5 at 2016-04-1

External interrupts are complicated because of the need to establish a correspondence between hardware interrupts and vector numbers. External interrupts are divided into non-shielded interrupts (NMI) and masked interrupts, which are received by the

1. Du-sh View directory, total file size-A: All files and directory sizes are listed. If you do not add any options and parameters, only the size of the table of contents (including subdirectories) is listed.-C: Last add total2. Df-h View disk usage3

First, what is VIM/VI?Vim/vi is a powerful full-screen text compiler that is the most commonly used text compiler on Linux platforms,Used to create, edit, and display text files (the programming platform under the Linux platform) is mainly used for

ViOpen or NewVI filename Opens or creates a new file and places the cursor at the beginning of the firstcursorThe cursor moves to the end of the sentence(The cursor moves to the beginning of the sentence screen Tumbling Class commandCtrl+u the

Mount: Equivalent to the allocation letter under Windows. First, create a custom two, allocation size: 1. Must partition: Root partition: \ (last divided) swap partition: Swap partition (twice times the size of memory 2000MB) it is in the same

In Linux systems, there are two ways to modify the hostname 1, which takes effect temporarily. 2, permanent effectTemporary effective Demo:[[email protected] ~]# hostname 123 Modify host name 123[[email protected] ~]# logout ctrl+d exit [[email

4.1 Multi-tasking Multi-tasking operating system: concurrently interactively executing multiple processesMultitasking operating systems can cause multiple processes to clog or sleep. These tasks, although they are in memory, are not in a functioning

SSH remote login Linux display-bash-4.1$ solutionLinux system new users with SSH remote login display-bash-4.1$, do not display the user name pathMethod/StepCause: The root cause of this problem is the lack of a shell environment. The

#!/bin/SHExport LANG="ZH_CN. UTF-8"# Export Mono_iomap=" All"# Export Mono_external_encodings="gbk:gb18030:gb2312"Ulimit-shn20000>/dev/NULL 2>&1PORT= theC_dir=$(pwd) Tn_home=$ (CD $ (dirname$0);pwd)if[" $"="- b"]; ThenCD ${tn_home}

First, the Linux boot process1, firmware firmware (Cmos/bios) post power-on self-test2. Bootloader bootloader (GRUB) loaded into kernel3. Load kernel kernel drive hardware4. Startup process Init5. Read the execution configuration file/etc/inittabA.

BackgroundAfter restarting the virtual machine on one day linux , windows after my connection samba , when I click some folders, there will be no permission to open the situation. This is a problem that I have reconfigured several times samba in the

Analysis of DMA in Linux DMA is a hardware mechanism that enables bidirectional data transmission between peripherals and system memory without the involvement of the CPU.. Using DMA can remove the system CPU from the actual I/O data transmission

CentOS6.5 install Openresty The first step to Learning Open-source software is to go to the official website and check the installation guide and demo (examples ). For openresty, the official website provides detailed installation instructions:Http:/