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Full Discussion: How to add a Y/N option?
Top Forums Shell Programming and Scripting How to add a Y/N option? Post 302970618 by kshji on Saturday 9th of April 2016 03:54:24 AM
Old 04-09-2016
Here is two examples. Also
Code:
read -p

is usable.

Using read -n 1.
Code:
#!/bin/ksh
# bash/ksh93/zsh/... but not dash (=posix)

# if read key ENTER, bash return newline and ksh return carriage return
cr=$'\r'  # ENTER key ksh
while printf "Continue:Y\b"
      read -n 1 response
      printf "\r                  \n"
      case "$response" in
                $cr|Y|y|"") response="Y" ;; # default = ENTER
                n|N) reponse="N" ;;
                *) response="N" ;;
      esac
      [ "$response" = "Y" ]
do
                echo "Do ..."
                date
                echo "..."
done

echo 'Goodbye.'

Using dd = take dump from stdin, 1 char.
Code:
# keypressed, read 1 char from stdin using dd
# works using any sh-shell
readkbd() {
  stty -icanon -echo
  dd bs=1 count=1 2>/dev/null
  stty icanon echo
}

while printf "Continue:Y\b"
      response=$(readkbd)
      printf "\r                  \n"
      case "$response" in
                Y|y|"") response="Y" ;; # default = ENTER
                n|N) reponse="N" ;;
                *) response="N" ;;
      esac
      [ "$response" = "Y" ]
do
                echo "Do ..."
                date
                echo "..."
done

echo 'Goodbye.'

 

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LEARN ABOUT FREEBSD

atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

BSD
								September 27, 2014							       BSD
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