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Full Discussion: Nonblocking I/O in bash scripts
Top Forums Shell Programming and Scripting Nonblocking I/O in bash scripts Post 302245706 by neked on Friday 10th of October 2008 06:39:29 PM
Old 10-10-2008
Pretty damn cool cfajohnson.

Here is my implementation based on your stty idea and some modifications:

Code:
#!/bin/bash

if [ -t 0 ]; then
    stty -echo -icanon time 0 min 0
fi;

read line
echo "The input was, if any: " $line

if [ -t 0 ]; then
    stty sane
fi;

if that code was saved in an executable named test.sh, then you could do the following:

Code:
bash$ ./test.sh
The input was, if any: 
bash$ echo "test" | ./test.sh
The input was, if any: test

The reason I'm using the if [ -t 0 ]; statement is to make sure that standard input is coming from the terminal, not a pipe, otherwise you'll get annoying errors:
Code:
stty: standard input: Invalid argument

 

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LEARN ABOUT NETBSD

gtty

STTY(3) 						   BSD Library Functions Manual 						   STTY(3)

NAME

     stty, gtty -- set and get terminal state (defunct)

LIBRARY

     Compatibility Library (libcompat, -lcompat)

SYNOPSIS

     #include <sgtty.h>

     stty(int fd, struct sgttyb *buf);

     gtty(int fd, struct sgttyb *buf);

DESCRIPTION

     These interfaces are obsoleted by ioctl(2).  They are available from the compatibility library, libcompat.

     The stty() function sets the state of the terminal associated with fd.  The gtty() function retrieves the state of the terminal associated
     with fd.  To set the state of a terminal the call must have write permission.

     The stty() call is actually 'ioctl(fd, TIOCSETP, buf)', while the gtty() call is 'ioctl(fd, TIOCGETP, buf)'.  See ioctl(2) and tty(4) for an
     explanation.

DIAGNOSTICS

     If the call is successful 0 is returned, otherwise -1 is returned and the global variable errno contains the reason for the failure.

SEE ALSO

     ioctl(2), tty(4)

HISTORY

     The stty() and gtty() functions appeared in 4.2BSD.

BSD
								   June 4, 1993 							       BSD
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