ode learning management system

= +, effective uid= +lienhua34:demo$su# ChownRoot tsys#chmodu+s tsys#ls-L Tsys-rwsrwxr-x1Root Lienhua347358October the at:Panax Notoginsengtsys# exitexitlienhua34:demo$./tsys./printuidsreal UID= +, effective uid=0During the execution of the above, we set the owner of the Tsys file to Superuser root and set the user ID bit. Thus, when executing the Tsys file, the process has a valid user ID of 0 (that is, root). The child process that calls the system

LVM Management and Linux system installation1. Preface2.LVM Introduction and terminology3.LVM use4.Linux Partitioning5.Linux Installation ConsiderationsFirst, prefaceThis blog post records the learning experience of Linux, with a focus on the application of Logical Volume Manager (LVM, logical volume management) techno

repair command: FSCK partition device file name Show disk status command: DUMPE2FS partition device file name mount Command:Query System mounted devices: Mount-lAuto Mount: mount-a--automatically mounts according to the contents of the profile/etc/fstabMount command format: Mount [-t file system] [-l volume label name] [-o Special Options] device file name mount pointmounting discs and USB sticks:Mountin

environment in which there is a route, there is a signal controller, because the semaphore is an enumeration, do not instantiate here, directly in the controller associated with a semaphore can be.The test code is as follows://Package com.fylx.test; Public classtest{ Public Static voidMain (string[] args) {//TODO auto-generated Method StubString[] Lamps =NewString[] {"s2n","s2w","e2w","E2s","n2s","n2e","w2e","w2n","s2e","e2n","n2w","W2s" }; for(String lamp:lamps) {//according to the signal, in

,moosefs, MogileFS, Hdfs,gfs, GlusterfsTo create a file system:MKFS ( It is actually called according to the different file types, corresponding to the other formats of the/sbin under MKFS.EXT2,MKFS.EXT4, and so on-T)MKFS-T type DEVICE Example: Mkfs–t ext4/dev/sdb1 =mkfs.ext4/dev/sdb1MKE2FS ( Special Management tool for Ext Series file system):mke2fs-t {EXT2|EXT3|EXT4} DEVICE-B block:1024, 2048, 4096- l ' L

021101, part-time 021102), Opening time (2016-06-23) ...2) Permission table:HNA, mailbox, external network mailbox send and receive permissions, Lync, WWW, collaboration platform ...3) Organization Chart:Full name, abbreviation ...Second, AD (Active Directory) synchronization program1, the synchronization process:Extracts data from the database and then runs the server program to synchronize the data to the Active Directory2. Necessity:The database can process the corresponding data quickly and

check the log recordsChunks can know that the file has a problem, so you can do a consistent check on the problem.To view the time status information for a file:Mtime: File modification time (ls default display)CTime: File creation timeAtime: Last access time for filesView command: Ls-al--time=ctime/atime PATHLink:Hard Links:Meaning: A hard link is a copy of the Inode attribute of a fileAdvantages: So in the deletion of the previous file, in fact, the data is not really deleted, only the link a

Commands for System Management classescommands for the System Management class : # shutdown (command) [option] ... Time -r : Restart h: shut down -c : Cancel restart or shutdown command time format: now Span style= "font-size:14pt" >

/s txcmp/s rxmcst/s12:10:01 AM Lo 0.00 0.00 0.00 0.00 0.00 0.00 0.0012:10:01 AM eth0 0.62 0.04 0.04 0.01 0.00 0.00 0.0012:10:01 AM eth1 0.59 0.01 0.04 0.00 0.00 0.00 0.00RXPCK/S indicates the number of packets received per second txpck/s Indicates the number of packets per second rxkb/s amount of data received per second txkb/s amount of data sent per second5 free View memory conditionTotal used free shared buffers cachedmem:1906900 274296 1632604 232 24268 111232-/+ buffers/cache:138796 176810

Inode record file attributes/permissions and other data, each inode size is fixed to 128bytes; Each file consumes only one inode, so the number of files the file system can build is related to the number of inode.7. The actual data of the block record file of the file, the block of the directory records the comparison table of the filename and its inode number.8, log (joural) file system will be more than

actions in topM: Sorts based on the size of the resident memory.P: Sorts according to the percentage size of CPU usage.T: Sort by Time/cumulative time.1: Can toggle display of all CPU usage statusQ: Exit TopTOP-BN1 output all information at once, static displaySAR command Monitors system Status4 SARIt can monitor all the resource status of the system, we mainly use it to monitor the network card.1 Viewing

rootfs: Root file System /boot: System startup related files such as kernel, INITRD, and Grub (bootloader) /dev: device files Device files: block devices: Random access, data blocks Character Devices: Linear access, by character device number: Master device Good (major) and secondary device number (minor) /etc: Config file / Home: The user's home directory, each user's home directory usually

MVC Development Mode: The Model Layer View Layer control layer in the student management system, the model layer has a student entity class, data access to the DAO layer, The view layer is mainly used to display information interface, control layer is mainly servlet processing user requestsIn the student management system