我想暂停shell脚本中的输入,并提示用户进行选择。标准的是、否或取消类型问题。如何在典型的bash提示符中完成此操作?
当前回答
更通用的是:
function menu(){
title="Question time"
prompt="Select:"
options=("Yes" "No" "Maybe")
echo "$title"
PS3="$prompt"
select opt in "${options[@]}" "Quit/Cancel"; do
case "$REPLY" in
1 ) echo "You picked $opt which is option $REPLY";;
2 ) echo "You picked $opt which is option $REPLY";;
3 ) echo "You picked $opt which is option $REPLY";;
$(( ${#options[@]}+1 )) ) clear; echo "Goodbye!"; exit;;
*) echo "Invalid option. Try another one.";continue;;
esac
done
return
}
其他回答
echo "Please enter some input: "
read input_variable
echo "You entered: $input_variable"
一种简单的方法是使用xargs-p或gnu-parallel-interactive。
我更喜欢xargs的行为,因为它像其他交互式unix命令一样,在提示符后立即执行每个命令,而不是收集yes以在最后运行。(在完成所需任务后,可以按Ctrl-C键。)
例如。,
echo *.xml | xargs -p -n 1 -J {} mv {} backup/
Bash为此选择了。以下是如何在脚本中使用它:
select result in Yes No Cancel
do
echo $result
done
这是它使用的样子:
$ bash examplescript.sh
1) Yes
2) No
3) Cancel
#? 1
Yes
#? 2
No
#? 3
Cancel
#?
您可以编写一个函数来测试:
confirm() {
local ans IFS=;
while read -rp "$1" -n1 ans;
do printf '\n';
case $ans in [Yy]) return 0;;
[Nn]) return 1;;
esac;
done;
}; ## Usage: if confirm "Are you sure? "; then ...
if confirm "Does everything look ok...reboot now? [Y/n]"; then
echo "rebooting..."
sleep 5
reboot
fi
受到@Mark和@Myrdin的回答的启发,我创建了一个通用提示的函数
uniprompt(){
while true; do
echo -e "$1\c"
read opt
array=($2)
case "${array[@]}" in *"$opt"*) eval "$3=$opt";return 0;; esac
echo -e "$opt is not a correct value\n"
done
}
这样使用:
unipromtp "Select an option: (a)-Do one (x)->Do two (f)->Do three : " "a x f" selection
echo "$selection"