github.com/lmorg/murex@v0.0.0-20240217211045-e081c89cd4ef/docs/user-guide/namedpipes.md (about) 1 # Named Pipes 2 3 > A detailed breakdown of named pipes in Murex 4 5 ## Background 6 7 [Wikipedia describes](https://en.wikipedia.org/wiki/Named_pipe) a named pipe as the following: 8 9 > In computing, a named pipe (also known as a FIFO for its behavior) is an 10 > extension to the traditional pipe concept on Unix and Unix-like systems, and 11 > is one of the methods of inter-process communication (IPC). The concept is 12 > also found in OS/2 and Microsoft Windows, although the semantics differ 13 > substantially. A traditional pipe is "unnamed" and lasts only as long as the 14 > process. A named pipe, however, can last as long as the system is up, beyond 15 > the life of the process. It can be deleted if no longer used. Usually a named 16 > pipe appears as a file, and generally processes attach to it for IPC. 17 18 Where Murex differs from standard Linux/UNIX is that named pipes are not 19 special files but rather an object or construct within the shell runtime. This 20 allows for more user friendly tooling and syntactic sugar to implemented around 21 it while largely still having the same functionality as a more traditional file 22 based named pipe. 23 24 ## In Murex 25 26 In Murex, named pipes are described in code as a value inside angle brackets. 27 There are four named pipes pre-configured: `<in>` (STDIN), `<out>` (STDOUT), 28 `<err>` (STDERR), and `<null>` (/dev/null equivalent). 29 30 You can call a named pipe as either a method, function, or parameter. 31 32 **As a method:** 33 34 ``` 35 <in> -> command parameter1 parameter2 parameter3 36 ``` 37 38 **As a function:** 39 40 ``` 41 command parameter1 parameter2 parameter3 -> <out> 42 ``` 43 44 **As a parameter:** 45 46 ``` 47 command <out> <!err> parameter1 parameter2 parameter3 48 ``` 49 50 ## See Also 51 52 * [`<read-named-pipe>`](../parser/namedpipe.md): 53 Reads from a Murex named pipe 54 * [`<stdin>`](../commands/stdin.md): 55 Read the STDIN belonging to the parent code block 56 * [`test`](../commands/test.md): 57 Murex's test framework - define tests, run tests and debug shell scripts 58 59 <hr/> 60 61 This document was generated from [gen/user-guide/named-pipes_doc.yaml](https://github.com/lmorg/murex/blob/master/gen/user-guide/named-pipes_doc.yaml).