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
您可以在读取时使用默认REPLY,将其转换为小写,并使用表达式与一组变量进行比较。该脚本还支持ja/si/oui
read -rp "Do you want a demo? [y/n/c] "
[[ ${REPLY,,} =~ ^(c|cancel)$ ]] && { echo "Selected Cancel"; exit 1; }
if [[ ${REPLY,,} =~ ^(y|yes|j|ja|s|si|o|oui)$ ]]; then
echo "Positive"
fi
其他回答
在我的情况下,我需要从下载的脚本中读取。,
curl -Ss https://example.com/installer.sh | sh
在这种情况下,read-ryn</dev/tty行允许它读取输入。
printf "These files will be uploaded. Is this ok? (y/N) "
read -r yn </dev/tty
if [ "$yn" = "y" ]; then
# Yes
else
# No
fi
echo "Please enter some input: "
read input_variable
echo "You entered: $input_variable"
用最少的行数实现这一点的最简单方法如下:
read -p "<Your Friendly Message here> : y/n/cancel" CONDITION;
if [ "$CONDITION" == "y" ]; then
# do something here!
fi
if只是一个例子:如何处理这个变量取决于您。
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
}
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/