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Full Discussion: Need help with repeating variables in a shell script
Top Forums UNIX for Dummies Questions & Answers Need help with repeating variables in a shell script Post 302760725 by Corona688 on Thursday 24th of January 2013 01:32:02 PM
Old 01-24-2013
This uses the terminal's built-in properties for read timeouts:
Code:
#!/bin/sh

old_tty_settings=$(stty -g)
# This restores the terminal settings even if you quit with ctrl-C
trap "stty $old_tty_settings" EXIT

stty -echo -icanon min 1 time 1

STRING=$(dd if=/dev/tty count=1 2>/dev/null)

echo "Read $STRING"

The terminal waits for multiple keystrokes yet times out quickly, and no loop is required. I can't type fast enough to get more than one letter in, but if I paste something to the terminal it gets the whole thing.

You still have to use dd, not the read builtin, because read messes with the terminal device too, undoing all the fancy settings you've been trying to arrange.
 

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gtty

stty(2) 							System Calls Manual							   stty(2)

NAME

       stty(), gtty() - control terminal device (Bell Version 6 compatibility)

SYNOPSIS

   Remarks
       These system calls are preserved for backward compatibility with Bell Version 6.  They provide as close an approximation as possible to the
       old Version 6 functions.  All new code should use the and calls described in termio(7).

DESCRIPTION

       For certain status settings and status inquiries about terminal devices, the functions and are equivalent to

       and

       respectively (see ioctl(2) and termio(7).

RETURN VALUE

       and return the following values:

	      Successful completion.
	      Failure.
		     is set to indicate the error.

ERRORS

       If or fails, is set to one of the following values:

       [EBADF]	      is not a valid file descriptor.

       [EFAULT]       points to an invalid address.

WARNINGS

   Obsolescent Interfaces
       and are to be obsoleted at a future date.

SEE ALSO

       stty(1), exec(2), ioctl(2), sttyV6(7), termio(7), tty(7).

								  TO BE OBSOLETED							   stty(2)
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