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Top Forums UNIX for Dummies Questions & Answers Definition for the UNIX term Pipe Post 302184925 by matt.d on Sunday 13th of April 2008 04:34:00 PM
Old 04-13-2008
A pipe is represented by the | character. It uses the output of the command to the left of it as the input to the command on the right of it.

Example: Say you want to look at all of the processes on your box. You'd run:

Code:
ps -eaf

but that's usually a page or more of information, and you want to look at them page-by-page.

Well, the "more" command allows you to look at information page-by-page. We can utilize the pipe to send the output of the "ps -eaf" command into the "more" command and look at all the processes page-by-page. Lookit:

Code:
ps -eaf | more

You can string those things together for a mile if you want. You're not limited to just one pipe on the command line.

What if I wanted to view all the oracle processes? I would execute:

Code:
 ps -eaf | grep oracle

But what if that output was over a page long and I wanted to view them page-by-page. The following command illustrates the ability to have more than one pipe in a single command:

Code:
 ps -eaf | grep oracle | more

 

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term::ansi::ctrl::unix(n)					 Terminal control					 term::ansi::ctrl::unix(n)

__________________________________________________________________________________________________________________________________________________

NAME
term::ansi::ctrl::unix - Control operations and queries SYNOPSIS
package require Tcl 8.4 package require term::ansi::ctrl::unix ?0.1? ::term::ansi::ctrl::unix::import ?ns? ?arg...? ::term::ansi::ctrl::unix::raw ::term::ansi::ctrl::unix::raw ::term::ansi::ctrl::unix::columns ::term::ansi::ctrl::unix::rows _________________________________________________________________ DESCRIPTION
WARNING: This package is unix-specific and depends on the availability of two unix system commands for terminal control, i.e. stty and tput, both of which have to be found in the $PATH. If any of these two commands is missing the loading of the package will fail. The package provides commands to switch the standard input of the current process between raw and cooked input modes, and to query the size of terminals, i.e. the available number of columns and lines. API
INTROSPECTION ::term::ansi::ctrl::unix::import ?ns? ?arg...? This command imports some or all attribute commands into the namespace ns. This is by default the namespace ctrl. Note that this is relative namespace name, placing the imported command into a child of the current namespace. By default all commands are imported, this can howver be restricted by listing the names of the wanted commands after the namespace argument. OPERATIONS ::term::ansi::ctrl::unix::raw This command switches the standard input of the current process to raw input mode. This means that from then on all characters typed by the user are immediately reported to the application instead of waiting in the OS buffer until the Enter/Return key is received. ::term::ansi::ctrl::unix::raw This command switches the standard input of the current process to cooked input mode. This means that from then on all characters typed by the user are kept in OS buffers for editing until the Enter/Return key is received. ::term::ansi::ctrl::unix::columns This command queries the terminal connected to the standard input for the number of columns available for display. ::term::ansi::ctrl::unix::rows This command queries the terminal connected to the standard input for the number of rows (aka lines) available for display. BUGS, IDEAS, FEEDBACK This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category term of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for either package and/or documentation. KEYWORDS
ansi, columns, control, cooked, input mode, lines, raw, rows, terminal COPYRIGHT
Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net> term 0.1 term::ansi::ctrl::unix(n)
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