# phpman > man > REVTWOWAY(3am)

[REVTWOWAY(3am)](https://www.chedong.com/phpMan.php/man/REVTWOWAY/3am/markdown)                        GNU Awk Extension Modules                       [REVTWOWAY(3am)](https://www.chedong.com/phpMan.php/man/REVTWOWAY/3am/markdown)



## NAME
       revtwoway - Reverse strings sample two-way processor extension

## SYNOPSIS
       @load "revtwoway"

       BEGIN {
           cmd = "/magic/mirror"
           print "hello, world" |& cmd
           cmd |& getline result
           print result
           close(cmd)
       }

## DESCRIPTION
       The  _revtwoway_ extension adds a simple two-way processor that reverses the characters in each
       line sent to it for reading back by the AWK program.  It's main purpose is  to  show  how  to
       write a two-way extension, although it may also be mildly amusing.

## SEE ALSO
       _GAWK:_  _Effective_ _AWK_ _Programming_, [_filefuncs_(3am)](https://www.chedong.com/phpMan.php/man/filefuncs/3am/markdown), [_fnmatch_(3am)](https://www.chedong.com/phpMan.php/man/fnmatch/3am/markdown), [_fork_(3am)](https://www.chedong.com/phpMan.php/man/fork/3am/markdown), [_inplace_(3am)](https://www.chedong.com/phpMan.php/man/inplace/3am/markdown), _ord__‐
       [_chr_(3am)](https://www.chedong.com/phpMan.php/man/chr/3am/markdown), [_readdir_(3am)](https://www.chedong.com/phpMan.php/man/readdir/3am/markdown), [_readfile_(3am)](https://www.chedong.com/phpMan.php/man/readfile/3am/markdown), [_revoutput_(3am)](https://www.chedong.com/phpMan.php/man/revoutput/3am/markdown), [_rwarray_(3am)](https://www.chedong.com/phpMan.php/man/rwarray/3am/markdown), [_time_(3am)](https://www.chedong.com/phpMan.php/man/time/3am/markdown).

## AUTHOR
       Arnold Robbins, **<arnold@skeeve.com>**.

## COPYING PERMISSIONS
       Copyright © 2012, 2013, 2018, Free Software Foundation, Inc.

       Permission is granted to make and distribute verbatim copies of this manual page provided the
       copyright notice and this permission notice are preserved on all copies.

       Permission  is granted to copy and distribute modified versions of this manual page under the
       conditions for verbatim copying, provided that the entire resulting derived work is  distrib‐
       uted under the terms of a permission notice identical to this one.

       Permission  is  granted  to copy and distribute translations of this manual page into another
       language, under the above conditions for modified versions, except that this  permission  no‐
       tice may be stated in a translation approved by the Foundation.



Free Software Foundation                     Feb 21 2018                              [REVTWOWAY(3am)](https://www.chedong.com/phpMan.php/man/REVTWOWAY/3am/markdown)