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Each | tells the shell to connect the standard output of the command on the left to the standard input of the command on the right by an inter-process communication mechanism called an (anonymous) pipe, implemented in the operating system. Pipes are unidirectional; data flows through the pipeline from left to right.
Windows Subsystem for Linux (WSL) is a feature of Microsoft Windows that allows for using a Linux environment without the need for a separate virtual machine or dual booting. WSL is installed by default in Windows 11. [3] In Windows 10, it can be installed either by joining the Windows Insider program or manually via Microsoft Store or Winget. [4]
Anonymous pipe: A unidirectional data channel using standard input and output. Data written to the write-end of the pipe is buffered by the operating system until it is read from the read-end of the pipe. Two-way communication between processes can be achieved by using two pipes in opposite "directions". All POSIX systems, Windows Named pipe
In this case CreatePipe is used to create an anonymous pipe with separate handles for the read and write ends of the pipe. Read and write IO operations on the pipe are performed with the standard IO facility API functions ReadFile and WriteFile. On Microsoft Windows, reads and writes to anonymous pipes are always blocking. [1]
cat file > my_pipe The named pipe can be deleted just like any file: rm my_pipe A named pipe can be used to transfer information from one application to another without the use of an intermediate temporary file. For example, you can pipe the output of gzip into a named pipe like so (here out.gz is from above example but it can be any gz):
The POSIX subsystem was replaced in Windows XP and Windows Server 2003 by "Windows Services for UNIX", [2] (SFU) which is based in part on OpenBSD code and other technology developed by Interix, a company later purchased by Microsoft.
splice() works by using the pipe buffer. A pipe buffer is an in-kernel memory buffer that is opaque to the userspace process. A user process can splice the contents of a source file into this pipe buffer, then splice the pipe buffer into the destination file, all without moving any data through userspace.
yes can be used to send an affirmative (or negative; e.g. yes n) response to any command that would otherwise request one, thereby causing the command to run non-interactively. Piping yes to a command with many user-confirmation prompts will automatically answer all of those prompts with "yes" (typing 'y' and pressing return). The following ...