Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Programming
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Databases
Mail Systems
openSolaris
Eclipse Documentation
Techotopia.com
Virtuatopia.com

How To Guides
Virtualization
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Windows
Problem Solutions
Privacy Policy

  




 

 

The Art of Unix Programming
Prev Home Next


Unix Programming - Unix Interface Design Patterns - The Sink Pattern

The Sink Pattern

A sink is a filter-like program that consumes standard input but emits nothing to standard output. Again, its actions on the input data are controlled only by startup conditions.

This interface pattern is unusual, and there are few well-known examples. One is lpr(1), the Unix print spooler. It will queue text passed to it on standard input for printing. Like many sink programs, it will also process files named to it on the command line. Another example is mail(1) in its mail-sending mode.

Many programs that might appear at first glance to be sinks take control information as well as data on standard input and are actually instances of something like the ed pattern (see below).

The term sponge is sometimes applied specifically to sink programs like sort(1) that must read their entire input before they can process any of it.

The term ‘sink’ is traditional and common.


[an error occurred while processing this directive]
The Art of Unix Programming
Prev Home Next

 
 
  Published under free license. Design by Interspire