unixdev.net


Switch to SpeakEasy.net DSL

The Modular Manual Browser

Home Page
Manual: (SunOS-5.10)
Page:
Section:
Apropos / Subsearch:
optional field

enhance(1)                       User Commands                      enhance(1)



NAME
       enhance - enhanced command-line editing facilities

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 edit-
       ing  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 impercep-
       tible to the user, isn't necessary for correct operation  of  the  pro-
       gram.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(5) 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  con-
       trolling  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 con-
       trolling 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  pro-
       gram 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
       /usr/lib/libtecla.so    tecla library



       ~/.teclarc              tecla personal customization file.



ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:


       tab()     allbox;     cw(2.750000i)|    cw(2.750000i)    lw(2.750000i)|
       lw(2.750000i).   ATTRIBUTE  TYPEATTRIBUTE   VALUE   AvailabilitySUNWesu
       Interface StabilityEvolving


SEE ALSO
       libtecla(3LIB), attributes(5), tecla(5)



SunOS 5.10                        18 May 2004                       enhance(1)