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35 lines
852 B
35 lines
852 B
#!/bin/sh |
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question=$1 |
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default_answer=$(echo $2 | tr a-z A-Z) |
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# Capitalize the default answer and construct the prompt |
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if [ "$default_answer" = "Y" ]; then |
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prompt="${question} (Y/n)? " |
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else |
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prompt="${question} (y/N)? " |
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fi |
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# Handle Ctrl-C |
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trap "printf '\n'; kill -s SIGINT $$" 2 |
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# Use stty to make read command work for single character input |
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old_stty_cfg=$(stty -g) |
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stty raw -echo |
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printf "%s" "$prompt" >&2 |
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answer=$( while ! head -c 1 | grep -i '[yn]'; do true; done ) |
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stty "$old_stty_cfg" >&2 |
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# If no answer is given, use the default answer |
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if [ -z "$answer" ]; then |
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answer=$default_answer |
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fi |
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# Print the answer and return appropriate exit code |
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printf "%s\n" "$(echo $answer | tr a-z A-Z" >&2 |
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sleep 0.01 # Without this, answer gets overwritten by next echo |
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if [ "$answer" = "Y" -o "$answer" = "y" ]; then |
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exit 0 |
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else |
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exit 1 |
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fi |