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35 lines
860 B
35 lines
860 B
#!/bin/sh |
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# Define ask_yn, which asks a yes or no question and defaults to the specified choice. |
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# Outputs 1 for yes and 0 for no |
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ask_yn() { |
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default=${2:-"y"} |
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default=$(printf "%s" "$default" | tr '[:upper:]' '[:lower:]') |
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# Set prompt string |
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case "$default" in |
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y) prompt="Y/n" ;; |
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n) prompt="y/N" ;; |
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*) printf "Invalid default answer\n"; exit 1 ;; |
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esac |
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while true; do |
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trap 'stty sane; exit' INT |
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printf "%s (%s): " "$1" "$prompt" |
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stty raw -echo |
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answer=$(head -c 1) || exit |
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stty -echo |
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printf "\n" |
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case "$answer" in |
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"" ) answer="$default"; break;; |
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y|Y) answer="y"; break;; |
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n|N) answer="n"; break;; |
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esac |
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done |
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case "$answer" in |
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y|Y) printf "1";; |
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n|N) printf "0";; |
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esac |
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} |