script pipeline

Process communication is the exchange of information between processes (transferring data). The current computer system provides a multitasking parallel environment that requires the creation of processes for each task, whether it be an application or a system program.Each process is independent of each other, and different processes run in their own different memory spaces, so information transfer between processes cannot be done directly through variables or other data structures, but only thr

I. Mission1, learning Mkfifo and other functions;2, understand the characteristics of famous pipelines, blocking open and non-blocking open, etc.;3. Write a program about the famous pipeline process communication and run it.Second, related concepts1. Correlation functionThe function that creates the named pipe is Mkfifo, and the function prototype is:int Mkfifo (const char *__path, __mode_t __mode)Function: Create a new FIFO with a named pathParameter

Linux Shell Common Tips (10) pipeline combinationTwenty. To get the system run data through the pipeline Combination shell command :1. Output the 5 most memory-intensive commands in the current system:#1) Lists all the processes that are running on the current host through the PS command. #2) The normal sort (from small to large) in the form of a numeric value in the Fifth field. #3) shows only the last 5

1. Introduction:1) Same host:UNIX process communication mode: Nameless pipe, famous pipe, signalSystem V Mode: Semaphore, Message queue, shared memory2) network communication: SOCKET,RPC2. Piping:　　Nameless Pipe: A one-way pipeline established using the standard output of one process as the standard input of another process disappears after execution is complete. Primarily used between parent and child processes, or between two sibling processes. The

Famous pipe (FIFO) First, post the definition of a named pipe in the previous section. A well-known pipeline is an improvement to a nameless pipe that has the following characteristics: ① it can communicate with each other between two processes that are unrelated to each other; ② the pipe can be indicated by a pathname and is visible in the file system. After the pipeline is established, two processes c

A slightly more complex operation on a Linux Traditional Chinese medicine requires the use of a piping command "|" A combination of multiple commands, in the following form:Command 1 |Command 2 | Command 3 ...Some commands in Linux can be used directly in pipeline commands, some of which are not, and for commands that cannot be used directly for pipelines, you need to use the Xargs command: Find./-type F | Xargs md5sum >> Md5_rc1.txt Find

using the system under Linux requires caution , so what is the alternative?The standard I/O function library provides the Popen function, which initiates another process to execute a shell command line.Here we call the process calling Popen the parent process, and the process initiated by Popen is called a child process.The Popen function also creates a pipeline for inter-parent interprocess communication. The parent process either reads information f

Direct3D 11 Graphics pipeline PCs typically have two processors: CPUs and GPU, and you need to write code for each processor. These two parts have completely different schemas and instruction sets. In graphics programming, you need to write software for all two processors, use common languages for CPU applications, such as C + +, and HLSL for GPU. DirectX is the bridge between systems. Most of the articles on graphic programming focus on the CPU or t

ASP.net 2.0 contains a lot of secrets that, when you find it, can bring greater performance and extensibility to your program. For example, understanding the secret bottlenecks hidden in the membership and profile provider providers makes it easy to troubleshoot validation problems and make authorization operations faster. In addition, the ASP.net HTTP pipeline blocks to avoid the necessary code to execute on each request. Not only that, the ASP.net

中设定的全局变量无法在上一层shell去全局显示 unset variable [[email protected]~]#echo $c 123[[emailprotected]~]#unsetc[[email protected]~]#echo $c 8.9 environment variable configuration fileThere are two main types of environment variable configuration files for the system:1, the system level/etc/under the2, User level, the user's home directoryThe difference between profile and BASHRC is that profiles are loaded when the user logs on, and BASHRC is in effect when the shell

The main function of a pipe stream is to connect two threads for communication. Pipeline streams are also divided into two types: PipedInputStream and PipedOutputStream, and pipeline stream (PipedReader and PipedWriter. A PipedInputStream object must be connected to a PipedOutputStream object to generate a communication pipeline. PipedOutputStream can write data

Last update time: 2014-06-23A Java NiO pipeline is a one-way data connection between two threads. A pipe has a source channel and a sinking channel. You write data to a sinking channel. This data is then read from the source channel.Here's a plumbing principle:Create a pipelineYou can open a pipeline by calling the Pipe.open () method, like this:Pipe pipe = Pipe.open ();Write a pipelineIn order to write a

One, request answer protocol and RTT: Redis is a typical TCP server based on the C/S model. In the client-server communication process, the client is usually the first to initiate the request, the server performs the corresponding task after receiving the request, and finally sends the obtained data or the processing result to the client in the reply way. During this process, the client waits for the results returned by the server in a blocked manner. See the following command sequence: CLIENT:

The pipeline command operator is: rdquo; | rdquo;, which can only process the correct output information sent from the previous command, that is, the pipeline command operator of standardoutput is: "|", which can only process the correct output information transmitted through the previous command, that is, the standard output information. for stdandard Error information is not directly processed. Then, pa

Let's take a look at how IIS7.0 integrates request pipelines. Think of an integrated request pipeline as a set of basic linear steps, which must appear every time a page is provided (). In general, a certain authentication is required before authorization can be performed to retrieve the content, determine and execute the processing program required for the content, execute any necessary log records, and finally send a response. The integrated reques

. Net core 2.0 Learning Record (4): use Middleware and simulate the construction of the Middleware (RequestDelegate) pipeline, . Net Core 2 does not continue to use the pipeline events in the previous asp.net, but develops a new pipeline (Middleware ): Public class MiddlewareDemo {private readonly RequestDelegate _ next; public MiddlewareDemo (RequestDelegate nex

Example of php multi-thread pipeline communication This article introduces the example of multi-threaded pipeline communication in php. For more information, see.The code for multi-threaded php pipe communication is as follows: Export OPath = $ export OPath;} // write the pipeline function to start function open_write () {$ this-> w_pipe = fopen ($

?And the form of the other pages in the last lesson is also the font red, as follows:There is a problem, a larger site may need to load a page of coffee files and Scss files will be many, then load the page when the page will continue to send requests to the server to load these front-end files, if many of these files will affect the speed of page rendering. Rails also takes this into account, helping us do a lot of front-end optimizations, using assets pipe