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man pages section 1: User Commands

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Updated: Wednesday, February 9, 2022

enhance (1)


enhance - line editing facilities


enhance command [argument]...


enhance(1)                       User Commands                      enhance(1)

       enhance - enhanced command-line editing facilities

       enhance command [argument]...

       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

       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 re-displays any incompleted input line that the
       user has typed after it. 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 re-dis-
       played so often that it slows down output.

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

       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 pseudo 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 after-
       wards, 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.

       /usr/lib/libtecla.so    tecla library

       ~/.teclarc              tecla personal customization file.

       See attributes(7) for descriptions of the following attributes:

       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       |Availability                 |library/libtecla             |
       |Interface Stability          |Committed                    |

       libtecla(3LIB), attributes(7), tecla(7)

Solaris 11.4                      18 May 2004                       enhance(1)