linux practice exam

1. Framebuffer application Programming(1) Open the device file(2) Obtaining device informationMacro-defined commands in/linux/fb.hImmutable information Fscreeninfo, using the IOCTL parameter has a Fbioget_fscreeninfo macro name, indicating the use of the IOCTL from the driver to obtain the unchanging information of the LCD deviceVariable information vscreeninfo, using the IOCTL parameter with the Fbioget_vscreeninfo macro name, indicates that the vari

Article Title: Remote Control Technology and practice for Linux servers. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Concepts and origins of

According to the online article collation.Load balancer software LVs (Linux Virtual Server) concept paperLVS is based on the Linux operating system to establish a virtual server, to achieve the load balance between service nodes. It is implemented based on the Linux kernel. The 2.6.X kernel is integrated with the LVS module by default.The implementation of common

>/proc/sys/net/ipv4/conf/all/arp_ignore[[emailprotected]~]#echo2>/ proc/sys/net/ipv4/conf/lo/arp_announce[[emailprotected]~]#echo2>/proc/sys/net/ipv4/ Conf/all/arp_announcers1:10.9.9.2[[emailprotected]~]#ipaddr10.9.9.8/32dev lo[[emailprotected]~]#iprouteadd10.9.9.8devlo[[email protected]~]#echo1>/proc/sys/net/ipv4/conf/lo/arp_ignore[[emailprotected] ~]#echo1>/proc/sys/net/ipv4/conf/all/arp_ignore[[emailprotected]~]#echo 2>/proc/sys/net/ipv4/conf/lo/arp_announce[[emailprotected]~]#echo2>/proc/ Sy

. (Can not connect, not because of network problems, the host and virtual machine is the same network segment, do not need to be networked or log on) 　　　　 With respect to certificates, this problem may occur when the client generates a public private key pair, and the public key is written to the virtual machine: Guess this is a key file, and the files here are impossible to write. Can try to use sudo permissions, do not know, do not solve this problem, repla

enter on the Linux control Terminal:./mydaemon, Haha, why didn't you react? In fact, is not unresponsive, is you this Mydaemon program has been running in the background!Enter "Ps-ef" and see!See that Mydaemon! The PID of this run is 11618, the parent process is the PID is who? Linux init!4, Exit Daemon Program: The daemon program does not interact with console input and output, so it is unrealistic to con

1,linux the distribution of each release, the relationship between, and the difference betweenThere are mainly the following distributionsDebian-based, mainly Debian, Ubuntu, mintDebian is a free distribution that is maintained by community organizations and is fully compliant with the GNU code. Using the Dpkg package management methodUbuntu is a Debian-based Linux system for desktop untable two releasesMin

Linux signal Programming Practice (3) Signal Representation in the kernel (sigaction sigqueue) Representation of signals in the kernel The processing action of the actually executed signal is called the Delivery, the State between the signal generation and the Delivery, and the Pending ). A process can Block a signal. When a blocked signal is generated, it remains in the pending state until the process unb

Linux inter-process communication (IPC) Programming Practice (7) use of shared memory-System V shared memory (API) The system call mmap mentioned in the previous blog map a common file to implement shared memory. The System V shared memory described in this article is to map files in the shm of a special file System to implement shared memory communication between processes. That is to say, each shared memo

[Practice OK] in Linux, check the context of environment variables when the process (Program) is started. Because of the recent installation of jira in Linux, a Chinese plug-in is installed. Once it is set to start, it is in English, and after the terminal restarts again, it seems that the plug-in takes effect and it is restored to a normal Chinese interface. Fir

Install SVN on linux and import it (personal practice) The original SVN server was deployed on windowsPC. As the leader requested, svn should be set up on the linux server and imported. Therefore, this operation is performed. First, you need to download the required package from the official website. My package is 1.6.16, and the maximum package is 1.9 ,: Http:/

: Read file map **/int main (int Argc,char **argv) {if (argc! = 2) err_quit (" usage:. main Map Note points:1. Memory mapping cannot (and cannot) change the size of the file;2. The valid address space available for interprocess communication is not entirely limited to the size of the mapping file, but should be based on the size of the memory page (see test below);3. Once the file is mapped, all access to the mapped area is actually access to the memory area; When you map a region content write

" Accept for RecoverdirFilesystem in Use:ext4.imgUsing internal Journal at Inode 8Activ time After:sun June 7 22:43:54 2015Activ time Before:sun June 7 23:02:18 2015Inode 2 is allocatedUnknown code ext2 #0 for block bitmap for ext4.imgWarning:error-nr 2133571363 can not found file:/MAGIC-1: Start lost Directory searchMAGIC-2: Start lost File search--------Testdir/magic-2/image/jpeg/i_0000000012.jpg--------Testdir/magic-2/image/jpeg/i_0000000013.jpg--------Testdir/magic-2/image/jpeg/i_0000000014.

One, install the JDK Download the JDK first, link http://www.oracle.com/technetwork/java/javase/downloads/index.html, and select the JDK that corresponds to the platform.Because the author system is 32-bit, so I download the package is jdk-8u31-linux-i586.tar.gz. Unzip the JDK, move and rename it.TAR-ZXVF jdk-8u31-linux-i586.tar.gzMV Jdk1.8.0_31/usr/local Edit the environment variable, defi

expire.99999 expiration time, 99,999 days to expire.7 How many days before your password expires:: Password disabled for Linux time/etc/groupshrek:x:501:If Todd is added to the group, it can be shrek:x:501:todd directly, other usersLinux users only differentiate between a UID of 0 and a UID of not 0./etc/gshadowRarely used.Tail-5/etc/passwd only see the last five lines of passwd.head-5/etc/passwd View passwd header Five elements file.Useradd-g root,b

Linux users, user groups, and file permissions [command practice] linux permission system consists of users, user groups, and permissions. For theoretical aspects, you can refer to another article: linux to view all users and all user groups [theory] http://www.bkjia.com/ OS /201304/205743.html users are one by one log

[Practice OK] in Linux, check the context of environment variables when the process (program) is started. because of the recent installation of jira In Linux, a Chinese plug-in is installed. once it is set to start, it is in English, and after the terminal restarts again, it seems that the plug-in takes effect, and it is restored to normal Chinese... [

Hello, everyone. I am your holy Grail.It's time for you to explain to everyone in the Holy Grail.Today, I'm taking you on a big project, you believe it or not.If you accidentally open this document, I hope you'll be able to read this post for two days, so please respect my labor and pretend to finish it. Crossing, thank you.First, you are welcome to Watch the operation stepsWe're officially starting.Topic:Routing Configuration Practices:The network information of the server needs to be configure

Linux Practice One1: Maintenance method of software sourceRemove the DEB .When you enter a command on the command line, you can use the command completion method.After the download is complete, use the sudo dpkg-i skype.deb to complete the installation.2: Mastering The concept of Linux rights management. Linux Rights

LINUX practices and discussions on embedded systems-general Linux technology-Linux programming and kernel information. The following is a detailed description. 1. Practical Purpose Porting the KERNEL of KERNEL 2.6 to a mature embedded hardware platform; In order to practice the initial development requirements of an e