GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  ENHANCE (1)

NAME

enhance - A program that adds command-line editing to third party programs.

CONTENTS

Synopsis
Description
Deficiencies
Files
See Also
Author

SYNOPSIS

enhance command [ argument ... ]

DESCRIPTION

The enhance program provides enhanced command-line editing facilities to users of third party applications, to which one doesn’t have any source code. It does this by placing a pseudo-terminal between the application and the real terminal. It uses the tecla command-line editing library to read input from the real terminal, then forwards each just completed input line to the application via the pseudo-terminal. All output from the application is forwarded back unchanged to the real terminal.

Whenever the application stops generating output for more than a tenth of a second, the enhance program treats the latest incomplete output line as the prompt, and redisplays any incompleted input line that the user has typed after it. Note that the small delay, which is imperceptible to the user, isn’t necessary for correct operation of the program. It is just an optimization, designed to stop the input line from being redisplayed so often that it slows down output.

Note that the user-level command-line editing facilities provided by the Tecla library are documented in the tecla(7) man page

DEFICIENCIES

The one major problem that hasn’t been solved yet, is how to deal with applications that change whether typed input is echo’d by their controlling terminal. For example, programs that ask for a password, such as ftp and telnet, temporarily tell their controlling terminal not to echo what the user types. Since this request goes to the application side of the psuedo terminal, the enhance program has no way of knowing that this has happened, and continues to echo typed input to its controlling terminal, while the user types their password.

Furthermore, before executing the host application, the enhance program initially sets the pseudo terminal to noecho mode, so that everything that it sends to the program doesn’t get redundantly echoed. If a program that switches to noecho mode explicitly restores echoing afterwards, rather than restoring the terminal modes that were previously in force, then subsequently, every time that you enter a new input line, a duplicate copy will be displayed on the next line.

FILES

libtecla.a    -   The tecla library.
~/.teclarc    -   The tecla personal customization file.

SEE ALSO

tecla(7), libtecla(3)

AUTHOR

Martin Shepherd (mcs@astro.caltech.edu)
Search for    or go to Top of page |  Section 1 |  Main Index


ENHANCE (1) -->

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.