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Full Discussion: how can i know the pressed key is arrowup?
Top Forums Shell Programming and Scripting how can i know the pressed key is arrowup? Post 302492603 by homeboy on Tuesday 1st of February 2011 01:51:37 AM
Old 02-01-2011
how can i know the pressed key is arrowup?
Hi all,
I need to know how to test a pressed key is arrowup or arrowdown and etc..
I found that the "echo" won't print anything if i enter the arrowup in the below code:
Code:
read 
echo "you pressed $REPLY"

Then i find a way to achieve my goal.
Code:
  1 #! /bin/bash
  2 
  3 ARROWUP='\[A'
  4 read
  5 echo $REPLY | grep -q $UP
  6 if [ $? -eq 0 ];then
  7    echo "you pressed arrowup"
  8 fi

problem is where can i find "ARROWUP" is shown as \[A because in my terminal the arrowup key is shown as [[A and i'm afraid i won't remember that someday.Any command to show that?
 

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LEARN ABOUT OPENSOLARIS

noecho

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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