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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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LEARN ABOUT REDHAT

tty

TTY(4)							     Linux Programmer's Manual							    TTY(4)

NAME

       tty - controlling terminal

DESCRIPTION

       The  file /dev/tty is a character file with major number 5 and minor number 0, usually of mode 0666 and owner.group root.tty.  It is a syn-
       onym for the controlling terminal of a process, if any.

       In addition to the ioctl() requests supported by the device that tty refers to, the following ioctl() request is supported:

       TIOCNOTTY
	      Detach the current process from its controlling terminal, and remove it from its current process group, without attaching  it  to  a
	      new  process  group  (that  is,  set  its  process group ID to zero).  This ioctl() call only works on file descriptors connected to
	      /dev/tty; this is used by daemon processes when they are invoked by a user at a terminal.  The process attempts to open /dev/tty; if
	      the open succeeds, it detaches itself from the terminal by using TIOCNOTTY, while if the open fails, it is obviously not attached to
	      a terminal and does not need to detach itself.

FILES

       /dev/tty

SEE ALSO

       mknod(1), chown(1), getty(1), termios(3), console(4), ttys(4)

Linux								    1992-01-21								    TTY(4)
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