11-13-2005
Quote:
Originally Posted by fdarkangel
i too have a question on the topic.
how do i read from keyboard if stdin is actually stdout of another program. an example is less/more: keyboard input still works when they're piped.
This is more of a separate question. You probably should have started a new thread.
If you type "tty", you will see the name of your controlling terminal. If it is, say, /dev/pty/j2, then you could simply open that file to gain access to the keyboard. But it is a lot of work to get the name of your particular terminal, so there is a second way. In the unix environment, a process with a controlling terminal can open the special file /dev/tty and get their own controlling terminal. This won't work if there is no crontrolling terminal such as with a cron job. Even though there is only one file on the system called /dev/tty, each user that opens it will get his or her own keyboard.
However, this may not be a great move to make. Suppose that I have a complicated pipeline of 4 processes. If they all do this at the same time it will be pretty hopeless to get it all straight. And look at all the threads we get where folks need to script the su command and must "expect" to do it. Users tend to dislike programs that do this.
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LEARN ABOUT OPENSOLARIS
shell
shell(1F) FMLI Commands shell(1F)
NAME
shell - run a command using shell
SYNOPSIS
shell command [command] ...
DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise
/usr/bin/sh).
EXAMPLES
Example 1 A sample output of shell command.
Since the Form and Menu Language does not directly support background processing, the shell function can be used instead.
`shell "build prog > /dev/null &"`
If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe-
cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to
save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing.
shell can also be used to execute a command that has the same name as an FMLI built-in function.
NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments
will not be expanded by the shell because "local" means "local to the current process."
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
sh(1), attributes(5)
SunOS 5.11 5 Jul 1990 shell(1F)