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Unix System Administration Handbook 1997 October
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yesno
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Text File
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1990-10-02
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497b
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26 lines
#! /bin/sh
default="$2"
while :
do
echo "$1 [$default]? " | tr -d '\012' >/dev/tty # portable echo -n
read answer
case "$answer" in
'') answer="$default" ;;
esac
case "$answer" in
n*|N*) answer=no ;;
y*|Y*) answer=yes ;;
esac
case "$answer" in
!*) cmd="`expr \"$answer\" : '!\(.*\)'`"
trap : 2
${SHELL-/bin/sh} -c "$cmd" >/dev/tty
trap 2
echo '!' >/dev/tty
;;
yes|no) break ;; # NOTE BREAK OUT
*) echo "please answer \`yes' or \`no'" >/dev/tty ;;
esac
done
echo "$answer"