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Top Forums Shell Programming and Scripting Execute function as soon as input is provided in menu drive shell script Post 302975873 by drl on Monday 20th of June 2016 09:19:11 AM
Old 06-20-2016
Hi.

Some possibilities:
Code:
Read one and only one character

        1) bash & ksh: read -n1

        2) zsh: read -k 1

        3) 56 examples in various codes at:
           https://rosettacode.org/wiki/Keyboard_input/Obtain_a_Y_or_N_response
           ( Item 54 for shell, Verified 2016.06.20 )

        4) With dd and stty, encapsulated in a function:
                getchar()
                {
                  local oldstty char
                  oldstty=$(stty -g)
                  stty cbreak -echo
                  char=$( dd bs=1 count=1 2>/dev/null )
                  stty $oldstty
                  echo "$char"
                }
            ...
            char=$( getchar )

        5) qprompt, timer, specific characters, prompt-string, etc.; in c
           http://www.ibiblio.org/pub/historic-linux/ftp-archives/sunsite.unc.edu/Nov-06-1994/utils/shell/qprompt-2.3.tar.gz
           ( Verified 2016.06.20, compiles with warning, worked in 64-bit )

Best wishes ... cheers, drl

Edit 1: added link to old qprompt code.

Last edited by drl; 06-20-2016 at 10:45 AM..
 

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

NAME
cbreak, nocbreak, noraw, raw - set input mode controls 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 cbreak(void); int nocbreak(void); int noraw(void); int raw(void); DESCRIPTION
The cbreak() function enables the character input mode. This overrides any previous call to the raw() function and turns the stty flag ICANON off. The nocbreak() function sets the line canonical mode and turns the stty flag ICANON on without touching the ISIG or IXON flags. The noraw() function sets the line canonical mode and turns the stty flags ICANON, ISIG, and IXON all on. The raw() function sets the character input mode and turns the stty flags ICANON, ISIG, and IXON all off. This mode provides maximum con- trol over input. It is important to remember that the terminal may or may not be in character mode operation initially. Most interactive programs require cbreak() to be enabled. RETURN VALUES
On success, these functions return OK. Otherwise, they return ERR. ERRORS
None. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
getch(3XCURSES), halfdelay(3XCURSES), nodelay(3XCURSES), timeout(3XCURSES), libcurses(3XCURSES), attributes(5), standards(5), termio(7I) SunOS 5.11 5 Jun 2002 cbreak(3XCURSES)
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