Editing Vertical bar (section)

==== Pipe ====
{{Main|Pipeline (Unix)}}

A [[pipe (Unix)|pipe]] is an [[inter-process communication]] mechanism originating in [[Unix]], which directs the output (standard out and, optionally, standard error) of one process to the input (standard in) of another. In this way, a series of commands can be "piped" together, giving users the ability to quickly perform complex multi-stage processing from the [[Command-line interface|command line]] or as part of a [[UNIX shell script|Unix shell script]] ("bash file"). In most [[Unix shell]]s (command interpreters), this is represented by the vertical bar character. For example:

<code> [[grep]] -i 'blair' filename.log | [[More (command)#Unix|more]] </code>

where the output from the <kbd>grep</kbd> process (all lines containing 'blair') is piped to the <kbd>more</kbd> process (which allows a command line user to read through results one page at a time).

The same "pipe" feature is also found in later versions of [[DOS]] and Microsoft Windows.

This usage has led to the character itself being called "pipe".