Linux

Process virtual address space is an important abstraction of Linux. The system provides a 4 GB virtual address space for each running Linux Process without interfering with each other, you can only access your own virtual address space address. The

Device Drivers--- SCSI Device Support SCSI disk support SCSI generic support Device Drivers--- USB support Ohci hcd support USB Mass Storage support[*] USB Mass Storage write-protected media detection (experimental)[*] Freecom USB/atapi Bridge

Sendmail is the most important Email transmission proxy.Program. Understanding the working mode of email is very important. Generally, the email program is divided into user agents, transmission agents, and delivery agents. The specific command to

Install libevent first Mkdir downloadcd downloadwget http://monkey.org /~ Provos/libevent-2.0.12-stable.tar.gztar-zxvf libevent-2.0.12-stable.tar.gzcd libevent-2.0.12-stablemakesudo make install Then install memcached. Mkdir

Currently, in addition to the Linux standard file system ext2/ext3/ext4, there are many file systems, such as reiserfs, XFS, Windows vfat NTFS, network File System NFS and FLASH file system jffs2, yaffs/yaffs2 ubifs. Linux provides perfect support

The periodic scheduler is implemented in scheduler_tick. If the system is active, the kernel automatically calls the function at the frequency Hz. If no process is waiting for scheduling, you can disable the scheduler to reduce power consumption

The author's blog address: http://blog.sina.com.cn/samzhen1977 By Sam (zhufeng) sam_code@hotmail.com (HCI protocol introduction, HCIImplementation in bluez and HCI Programming Interface)   1. HCI Layer Protocol Overview: HCI provides a unified

Because you often need to download and install software, and the software that provides download is usually packaged and compressed, it is very important to package the compressed tar command, I found an article on "example and explanation of tar

Analysis of the ramdisk root file system creation process in Linux This article describes how to create the ramdisk root file system in Linux. 1. modify an existing File System   Set the file system compressed file to ramdisk.gz.   1. Extract   # Cd

1. Diff --------------------NameDiff-find differences between two filesSynopsisDiff [Options] From-file to-file-------------------- The diff function is used to compare the differences between the two files, and then record them, that is, the

1) The/etc/services file records the network service names and their corresponding port numbers and protocols. 2) Format Each row in the file corresponds to a service. It consists of four fields separated by tabs or spaces, service name, port used,

  As a system administrator, you may need to add users to a machine frequently, either by adding many users to a machine or by adding the same user to many machines. I am such a system engineer. Every time a new employee enters the company, he has

Sina Weibo: @ song Baohua Barry at @ micro disk shared the "Linux device driver development details" 2nd version 1080p electronic version, intends to upgrade to version 3rd, 3.6 kernel, Cortex-A9 SMP, Device Tree, dvfs, suspend/hibernation, big.

Chapter 9 Backup Recovery Linux uses the dump and restore commands to execute file system backup and recovery jobs, while Solaris uses ufsdump and ufsrestore.Quote: Linux #/Sbin/Dump-0u-F/dev/st0/home# Cd/home# Restore RF/dev/st0 Solaris #

This is an after-school exercise for advanced programming in UNIX environments. You are not allowed to use fcntl. You can't think of a more efficient method. Here, I will post my own practices, I hope some heroes can tell me an efficient way of

Absolute and relative Linux paths The absolute path in Linux is from the root directory. For example,/dev/somedir /.. The relative path starts from the current directory ./ There are four relative paths: Current

Operations related to process information are in the unistd. h file. The following functions are commonly used. Getuid Function prototype: uid_t getuid (void ); Function: gets the ID of the user who calls the process. Function return: the ID of the

    Note   This appendix is not applicable to non-x86 systems. However, the general principles mentioned here may

Passwd CommandFor the sake of system security, in Linux, each user has a user name and password. Therefore, when you use the useradd command to add a new user, you also need to use the passwd command to set a password for each new user. Later, you

Gpasswd commandFunction: Manage groupsUsage: gpasswd [-a user] [-D user] [-a user,...] [-M User,...] [-R] [-R] groupnameParameters:-A: Add a user to a group-D: delete a user from a group.-A: Specifies the administrator.-M: the specified group member