Linux actual user (group) ID, valid user (group) ID, set User (group) ID

Actual User (group) ID:Identifies who the user is, and the two fields are taken from the login entry in the password file when they log on.Valid user (group) ID:Determines access to the file, usually valid user (group) ID equals the actual user

Common Linux Basic commands

1, LS display directory properties-L: (can also be abbreviated to LL), list display permissions and other properties-A: Show all files including hidden files, etc.-D: Lists only the directory itself2, CHGRP change the group of files belong

Linux Network Programming IX: Splice function, efficient 0 copies

from:http://blog.csdn.net/jasonliuvip/article/details/22600569Linux Network Programming IX: Splice function, efficient 0 copiesRecently looking at "Linux High Performance Server Programming", here to do a diary to motivate themselves, while sharing

Linux commands: ln command

ln command Function descriptionThe ln command is used to create links between files or directories.There are two kinds of links under Linux, one is hard link, the other is symbolic link (symbolic link is often called soft link), the default is

Linux file system

Linux file system is a generalized file system, can be considered that the Linux system for any device and object operation is equivalent to the operation of the file.The Linux system abstracts all operational objects in a highly abstracted way,

The Mail command for Linux email

1. ConfigurationVim/etc/mail.rcAdd the following to the end of the fileSet from=[email protected]smtp= "Smtp.qq.com"Set smtp-auth-user= "[email protected]"Smtp-auth-password="123456 "Set Smtp-auth=loginDescription:From: The sender that appears when

Linux command: Echo set color

echo to change the color, use the parameter-eformat: echo-e "\033[word background color; font Color m string \033[0m"For example:echo-e "\033[41;36m something here \033[0m"Where 41 of the position represents the background, 36 of the position is the

Installation tutorial and compilation parameters in Linux under Nginx compilation

This article mainly introduces the Linux under the installation of Nginx compiler tutorial and compilation parameters, the need for friends can refer to the followingFirst, the necessary software preparation1. Installing PcreIn order to support the

Linux mount (Mount) command detailed

Linux is an excellent open-source operating system, can run in large-to-small to the palm of a variety of computer systems, with the growing maturity and stability of Linux systems and its unique advantages of open source code, Linux in the world

Linux basic commands

1: Create file: Touch file nameThe touch command can also change the access time and modification time of an existing file without changing the contents of the file.Change modification time only touch-m file nameChange access time only touch-a file

Linux File and directory management

We know that the directory structure of Linux is tree-like structure, the top-level directory is the root directory/.Other catalogs can be mounted to add them to the tree, and they can be removed by lifting the mount.Before starting this tutorial we

Original Several types of file transfer commands in Linux sz RZ sftp SCP Introduction

Several types of file transfer commands in Linux sz RZ sftp SCP Introduction1.sftpSecure FTPis a file transfer management tool based on SSH security protocol. Because it is based on SSH, the user's password, data and other sensitive information will

Linux one-time installation development tool: Yum Groupinstall development tools

[[email protected] ~]$ yum grouplist | more Loaded Plugins:fastestmirror, Refresh-packagekit, security Setting up Group Process Determining fastest mirrors * base:mirrors.tuna.tsinghua.edu.cn * extras:mirrors.tuna.tsinghua.edu.cn * updates:

Linux Mount/unmount Commands

Format: Mount [-parameter] [device name] [Mount Point]Among the parameters commonly used are:-A installs all file systems that are class-out in the/etc/fstab file.-F disguises mount, making checks on the device and the directory look, but does not

One Linux command per day: Linux file types and extensions

The Linux file type and the name of the Linux file represent the meanings of two different concepts. We create through general applications such as File.txt, file.tar.gz, these files, although to be opened with different programs, but in the Linux

Linux Mount/unmount Commands

Format: Mount [-parameter] [device name] [Mount Point]Among the parameters commonly used are:-A installs all file systems that are class-out in the/etc/fstab file.-F disguises mount, making checks on the device and the directory look, but does not

The difference between ps-ef and PS aux under Linux

They are all used to display the currently running process, but:PS aux is the BSD format to display the Java processThe items shown are: USER, PID,%cpu,%MEM, VSZ, RSS, TTY, STAT, START, Time, COMMANDPs-ef is the process of displaying Java in a

Linux-text-3

Bash's variable types are mainly: local variables, local variables, environment variables, positional variables, and special variables, where the $ in special variables? This variable is changing at any time, where the saved data is the execution

The concepts and differences of Linux packaging and compression

For those who have just come into contact, will certainly give Linux a large pile of various filenames to stun. Don't say, just for example, we know that the most common compressed files under Windows are only two, one is zip, the other is. rar. But

Reprint: 4412 Environment Construction: ARM-LINUX-GCC: No file or directory

4412 Environment Construction: ARM-LINUX-GCC: No file or directoryOctober 15, 2014 ? A total of 993 characters? size Small Medium big ? Review 11 article? Read 6,125 times Recently made a 4412 board (friendly arm of the Tiny4412 enhanced version),

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