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Full Discussion: Bash replacement to getchar
Top Forums Shell Programming and Scripting Bash replacement to getchar Post 302343881 by kshji on Friday 14th of August 2009 02:23:34 AM
Old 08-14-2009
With this you can debug:
Code:
trap 'echo "int shell"' HUP INT QUIT
echo -n "Press key:"
stty -echo raw
c=$(dd bs=1 count=1 2>/dev/null )
stty echo -raw
echo "<$c>"
echo $c | od -c

echo "press ctrl-c"
sleep 20

result: dd read one char from stdin. Also ctrl-c and ctrl-d are only chars. So you can test those chars.

Code:
trap ':'  HUP INT QUIT
c=""
while [ "$c" = "" ]
do
  # do c read, look previous dd or
  echo -n "key:"
  read -n 1 c 
  # test it
  case "$c" in
    \001) ;; # ctrl-A
    \003) ;; # ctrl-C
  esac
  # remove char ascii 01-04
  c=$(echo "$c" | tr -d "[\001-\004]" )
done

 

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echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME
echo, noecho - enable/disable terminal echo SYNOPSIS
cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib -R /usr/xpg4/lib -lcurses [ library... ] c89 [ flag... ] file... -lcurses [ library... ] #include <curses.h> int echo(void); int noecho(void); DESCRIPTION
The echo() function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially, curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control soft- ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined. RETURN VALUES
Upon successful completion, these functions return OK. Otherwise, they return ERR. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5) SunOS 5.11 5 Jun 2002 echo(3XCURSES)
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