Linux

Computer room A CentOS system server, because this server system installed a long time, and the root password update several times, back to the computer room on-site maintenance, login password forgotten, sad urge ah ~No way, only the boot into

everything in Linux is file, so files are important, file properties and how to change properties. to view the properties of a file:The owner of the file is divided into owners, owning groups, and others.after logging in as root , you can use ls-al

General Summary:　　1) boot BIOS self-test2) MBR boot3) Grub Boot Menu4) Load Kernel kernel5) Start the INIT process6) Read Inittab file, execute Rc.sysinit RC and other scripts7) Start Mingetty, enter the system login screen1> Boot BIOS Self

Close selinux– Use the Getenforce command to check the SELinux status, and if the result is not "Disabled", use the Setenforce 0 command to temporarily turn off SELinux.To permanently turn off SELinux, modify the/etc/selinux/config configuration

After partitioning and formatting the disk, we are still unable to use it immediately, one step further: MountUnder Windows OS the user cannot see this process because it is mounted automatically, and under Linux it is necessary for us to manually

User Information file: etc/passwdUser Shadow File: Etc/shadowUser group information file: Etc/groupUser group Shadow file: Etc/gshadowThe home directory for root is: etc/rootHome directory for normal users: etc/home/user name/User's mailbox:

return value of program outputStandard output return value: 0Standard error Output return value: 1-255echo $? To get the return value/dev/null: Device data (data black hole)Can output useless information to/dev/null such as Ls/var &>/dev/nullSet-c:

1. The subsystems included in the kernel are:Four subsystems such as process management system, memory management system, I/O management system and file management system.An executable file in a 2.Linux system is rooted and setid, and when an

When we use the Linux system, we must have used some shared files, such as Ftp,mount and so on, then I will focus on the use of Mount:There is now a test environment where you need to deploy Mount Server (10.10.10.27). You first need to turn on the

First, Installing the jdk-7u21-linux-x64.rpm file[Email protected] local]# RPM–IVH jdk-7u21-linux-x64.rpmSecond, firewall open 8080 port(Before-a forward-j REJECT--reject-with icmp-host-prohibited)Vi/etc/sysconfig/iptables-A input-p tcp-m

1. Each disk partition is treated as a separate device.2. Each storage device has its own local file system.3. Enter the mount command itself to display a list of file systems currently mounted on the system.4.which1.-t vfstype Specifies the type of

Recently always in the group to see a lot of classmates ask, there is no password exchange between Linux how to get Ah, Baidu's look at me dizzy and so on, so I write how in two Linux servers to achieve no password exchange visits, that is, let them

Restart command:1, reboot2. shutdown-r now reboot (root user)3, Shutdown-r 10 over 10 minutes automatic restart (root user use)4, Shutdown-r 20:35 restart at 20:35 time (root user use)If you set the restart through the shutdown command, you can

Three ways to view the number of threads in Linux 1, top-h Manual said:-h:threads Toggle plus this option to start a top,top line to display a thread. Otherwise, it displays a process one line. 2, PS XH Manual said: H Show threads as if they were

Linux operating system and common commands 1. Common commands in linux Windows: Dll: dynamic link library, dynamic link library Linux: . So: shared object, shared object Operating System: Kernel: 1. Process Management 2. kernel Management Library:

Linux document compression and packaging, linux Document Packaging From: http://www.apelearn.com/bbs/forum.php? Mod = viewthread & tid = 7660 & extra = page % 3D1% 26 filter % 3 Dtypeid % 26 typeid % 3D36 1. gzip ToolSyntax: gzip [-d #] filename

Linux disk management, linux Disk From: http://www.apelearn.com/bbs/forum.php? Mod = viewthread & tid = 7621 & extra = page % 3D1% 26 filter % 3 Dtypeid % 26 typeid % 3D36 1. view the disk or directory capacityDf view the usage of each disk

Yum LAN software source construction and yum LAN Construction From: http://www.linuxidc.com/Linux/2013-07/87315.htm 1. Set up an Apache server or an ftp serverYum installation or binary package installation 2. Prepare the RPM package to download the

Difference between su and sudo commands, and between susudo commands From: http://www.apelearn.com/bbs/thread-7467-1-1.html   I. Use the su command to temporarily switch user identities1. Conditions and power of suThe su command is a tool for

How to install Tomcat and install Tomcat Tomcat requires JDK support. Therefore, install JDK before installing Tomcat. 1. First download the JDK corresponding to your machine on the JDK official website. Note the number of machine digits. in Linux,