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
检查此项
read -p "Continue? (y/n): " confirm && [[ $confirm == [yY] || $confirm == [yY][eE][sS] ]] || exit 1
其他回答
这是我整理的东西:
#!/bin/sh
promptyn () {
while true; do
read -p "$1 " yn
case $yn in
[Yy]* ) return 0;;
[Nn]* ) return 1;;
* ) echo "Please answer yes or no.";;
esac
done
}
if promptyn "is the sky blue?"; then
echo "yes"
else
echo "no"
fi
我是一个初学者,所以要谨慎对待,但它似乎奏效了。
是/否/取消
作用
#!/usr/bin/env bash
@confirm() {
local message="$*"
local result=''
echo -n "> $message (Yes/No/Cancel) " >&2
while [ -z "$result" ] ; do
read -s -n 1 choice
case "$choice" in
y|Y ) result='Y' ;;
n|N ) result='N' ;;
c|C ) result='C' ;;
esac
done
echo $result
}
用法
case $(@confirm 'Confirm?') in
Y ) echo "Yes" ;;
N ) echo "No" ;;
C ) echo "Cancel" ;;
esac
使用干净的用户输入进行确认
作用
#!/usr/bin/env bash
@confirm() {
local message="$*"
local result=3
echo -n "> $message (y/n) " >&2
while [[ $result -gt 1 ]] ; do
read -s -n 1 choice
case "$choice" in
y|Y ) result=0 ;;
n|N ) result=1 ;;
esac
done
return $result
}
用法
if @confirm 'Confirm?' ; then
echo "Yes"
else
echo "No"
fi
在这种情况下,我已经多次使用case语句,使用case语句是一种很好的方法。可以实现while循环,该循环模拟case块,利用布尔条件,以便更好地控制程序,并满足许多其他要求。在满足所有条件后,可以使用中断,将控制权传递回程序的主要部分。此外,为了满足其他条件,当然可以在控制结构中添加条件语句:case语句和可能的while循环。
使用案例陈述来满足您的请求的示例
#! /bin/sh
# For potential users of BSD, or other systems who do not
# have a bash binary located in /bin the script will be directed to
# a bourne-shell, e.g. /bin/sh
# NOTE: It would seem best for handling user entry errors or
# exceptions, to put the decision required by the input
# of the prompt in a case statement (case control structure),
echo Would you like us to perform the option: "(Y|N)"
read inPut
case $inPut in
# echoing a command encapsulated by
# backticks (``) executes the command
"Y") echo `Do something crazy`
;;
# depending on the scenario, execute the other option
# or leave as default
"N") echo `execute another option`
;;
esac
exit
echo "Please enter some input: "
read input_variable
echo "You entered: $input_variable"
您可以使用内置的read命令;使用-p选项向用户提示问题。
从BASH4开始,您现在可以使用-i建议答案:
read -e -p "Enter the path to the file: " -i "/usr/local/etc/" FILEPATH
echo $FILEPATH
(但请记住使用“readline”选项-e以允许使用箭头键进行行编辑)
如果你想要一个“是/否”的逻辑,你可以这样做:
read -e -p "
List the content of your home dir ? [Y/n] " YN
[[ $YN == "y" || $YN == "Y" || $YN == "" ]] && ls -la ~/