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提供多个值时读取的输入验证

tag-icon • tag-icon shell-script
提供多个值时读取的输入验证

我想在用户提供多个输入的情况下验证用户输入

例子：

read order_number city cost

如果用户输入类似于texas 200输入的内容，我应该能够识别缺少订单号，当我尝试以下操作时，它总是说缺少成本：

read order_number city cost
echo ""
echo "Job details you have entered are:" $order_number $city $cost
echo ""

if [[ $order_number == '' ]] then
  echo "Order number can't be null"
  exit;
elif [[ $city == '' ]] then
  echo "city can't be null"
  exit;
elif [[ $cost == '' ]] then
  echo "cost can't be null"
  exit;
fi

答案1

根据每个变量必须满足的条件，您可以使用此脚本：

#!/usr/bin/bash

read order_number city cost

#Check if order_number is set 
# Validate order_number starts with any number(s) 
# followed by 0 or more letters and can finish with any letter or number
grep -E --silent "^[0-9]+[A-Za-z]*" <<< "$order_number" || {
   echo "'order_number' cannot be null."
   exit 1
}

#Check if city is set (starts with some letter followed by underscores or more letters )
grep -E --silent "^[A-Za-z][A-Za-z_]+$" <<< "$city" || {
   echo "'city' cannot be null."
   exit 1
}


#Check if cost is set (validate is a number)
grep -E --silent "^[0-9]+$" <<< "$cost" || {
   echo "'cost' cannot be null (and must be an Integer)"
   exit 1
}

例如，读取此字符串"102w1 Texas_ some"将导致：

'cost' cannot be null (and must be an Integer)

尽管cost已读取，但该some值不是数字，因此将被视为null。
如果您确实认为该字符串some不为空（对于成本变量），那么实现您想要的将会更加困难。

提示

你可以测试你的scriptbash非交互式通过使用这个方式：

./script < <(echo -n "102w1 Texas_ 30")

当我测试此类脚本时，使用上面的代码可以节省时间:)。

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