dd-keypress.sh

Shall高级编程

#!/bin/bash
# dd-keypress.sh: Capture keystrokes without needing to press ENTER.


keypresses=4                      # Number of keypresses to capture.


old_tty_setting=$(stty -g)        # Save old terminal settings.

echo "Press $keypresses keys."
stty -icanon -echo                # Disable canonical mode.
                                  # Disable local echo.
keys=$(dd bs=1 count=$keypresses 2> /dev/null)
# 'dd' uses stdin, if "if" (input file) not specified.

stty "$old_tty_setting"           # Restore old terminal settings.

echo "You pressed the \"$keys\" keys."

# Thanks, Stephane Chazelas, for showing the way.
exit 0