pipe file

Linux provides a number of commands that can be used to simplify our work, perhaps in the graphical interface to click on the mouse more than 10, and in the Linux system, a command can be easily resolved. Therefore, it is necessary to work on a

36.16.commands-utilities for runningcommandsDeprecated since version 2.6:the commands module has been removed in Python 3. Use the subprocess module instead.The commands module contains wrapper functions for Os.popen () which take a system command

Python 2.6 New multiprocessing, that is, multi-process, to the sub-process code debugging a bit difficult, such as Python's own PDB if you start directly in the child Process code will throw a bunch of exceptions, because the child process stdin/out/

"VI Use"1. In command line mode: Place the cursor on the function in the VI editor.SHIFT + KCan direct man manual, Exit man manual direct press two times Q: Directgg=gCan make files automatically aligned：GGNavigates to the beginning of the file, G

CLI (command line Interface) in the format:Command option ParametersCommand Options ... argumentsOptions: Short options:-character multiple options can be combined, such as-a-b=-abLong option:--wordParameters: The Action object of the commandControl

Process in the coordination of the kernel to communicate with each other, mainly including three kinds of methods: signal , pipe and socket interface three categories.1) Signal2) Pipeline3) Sockets: Message Queuing, semaphores, and shared

Process synchronization and communicationOperating System Tutorials: http://c.biancheng.net/cpp/html/2592.htmlThe synchronization and mutual exclusion of process refers to the mutual restrictive relationship of process in advancing.# Process

In the Linux operating system, each process has its own running space, the space is stored with data and execution code, then the different processes between each other is the exchange of data and information? Linux provides one of the most basic

Original link: http://www.orlion.ga/1072/Each process has a different user address space, the global variables of any one process can not be seen in another process, so the exchange of data between processes must pass through the kernel, a buffer in

Command type:Built-in command (shell built-in), internal, built-inExternal command: There is an executable file corresponding to the command name in a path on the file systemMan COMMAND:Sub-chapters:1: User command (/bin,/usr/bin,/usr/local/bin)2:

First, Windows and LinuxThe role of the dynamic-link library. dll file in Windows is the same as the. so file in Linux.The way to splice native Linux systems is to integrate the shell, Library, and kernel files.Second, the questionWhy is the C

One, bash variables:Variable naming laws:1. The reserved words in the program cannot be made: for example if, for;2, only use numbers, letters and underscores, and cannot start with a number3. See the meaning of the name4, the Uniform naming rule:

First, the operating systemShellGui:graphic User Interface GUIWindowsX-window:GnomeKdeXfceCli:command Line InterfaceShBashCshKshZshTcshTwo major Lei Feng Laboratories:Bell LabsXerox's Parc Lab: Ethernet, mouse, graphical user interfaceLibrary files:

Shell scripting is one of the skills that Linux OPS engineers have to master, and the use of shell scripts allows us to better operate Linux systems and facilitate our execution.One, the basics of programmingBASIC Programming ConceptsProgramming

1. Command Prompt#: Root$: Normal User2. Command Format[command option parameter]Options:Short Options:-Multiple options can be combined:-a-b =-abLong options:--Parameters:Action object of the command3. User SwitchingCommand format:[SU user name]4.

Manage Commands Ln, DF, Du, Mknod, Fdisk, Partprobe, Partx, Mkfs, Blkid, E2label, TUNE2FS, DUMPE2FS, fsckLN Create a linked file or directory-S Create soft links-V Show verbose processDF View disk information-H Humanistic Reading mode-I display

Find&locate of Linux File searchI. OverviewOne of the core ideas of Linux system "Everything is file", for so many files, how to quickly find filtering it? Let's take a look at the system-provided file lookup commands find and locat, skilled use of

1. Judging the format1) Test parameter fileExample: Test-e/root/install.log2) [parameter file]--Recommended useExample: [-e/root/install.log]Note: Spaces are required after and before the brackets2. determine file type parameters1)-D file: Determine

Ls-L Long formatFile type: the-Ordinary filesD; catalog fileB: Block device files (blocks)c; Character device files (character)l; Symbolic link files (symbolic link file)p; command pipe file (pipe)s; socket file (socket)File permissions: 9 bits per 3

File system:Rootfs: Root file systemFhs:linux/boot: System boot related files, such as kernel, INITRD, and Grub (bootloader)/dev: Device filesDevice files:Block devices: Random access, data blocksCharacter Devices: Linear access, by characterDevice