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Top Forums Shell Programming and Scripting Giving "read" from standard input a timeout. Post 64831 by vgersh99 on Wednesday 2nd of March 2005 03:16:06 PM
Old 03-02-2005
Quote:
Originally Posted by rello
I want to prompt a user for input but I want it to timeout after a specified time if no response is given. I tried the sleep command but this does not work. I am using ksh.
Thanks.
Code:
#!/bin/sh
#
STTY=`stty -g`
WAIT=60
printf 'enter [y/n] '
stty intr '' -icanon min 0 time $WAIT ignbrk -brkint -ixon isig
read ans
stty $STTY
case ${ans:=y} in [yY]*) ;; *) exit ;; esac
echo do the rest
exit

or read timeout

Last edited by vgersh99; 03-02-2005 at 04:49 PM..
 

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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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