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bash：读取文件时如何提示用户输入？

tag-icon • tag-icon bash scripting interactive
bash：读取文件时如何提示用户输入？

以下用于用户输入的脚本语句嵌套在 if 块下的 while 循环中，但它不起作用并且被跳过。如何让用户输入起作用？

exec 3<&0 && read -p 'Enter your answer: ' uservar <&3

FILE="hostnames.txt"
echo $(sudo chmod +777 $FILE)
echo "Step 1. Checking if file with hostnames exists."

#exec 3<&0

if [ -f "$FILE" ]
then
  echo "PASSED: File hostnames.txt does exist." && echo ""
  while IFS= read -r hostname;
    do
     echo "Step 2. Checking Grph mgmt_con_ip4 exists for $hostname"
     mgmt_con_ip4="$(echo "$(llama-grph node show $hostname | grep mgmt_con_i$
     echo "Grph has management IPv4 address: $mgmt_con_ip4"
     if [ -z $mgmt_con_ip4 ]
       then
         echo "PASSED: Grph mgmt_con_ip4 == NULL" && echo ""
       else
         echo "FAILED: Grph mgmt_con_ip4 == NOT NULL" && echo ""
         echo "$(ipam --format json get-cidr-parent $mgmt_con_ip4)" && echo ""
         echo "WARNING: OOB networks shouldn't have $mgmt_con_ip4 IPv4 addres$
         exec 3<&0 && read -p 'Enter your answer: ' uservar <&3
     fi
  done < $FILE
fi

答案1

你不应该混合read命令和相同的file descriptor input（FD）。在下面的例子中，我改变了最外面的readFD=3。这是代码片段：

  #!/bin/env bash

  FILE="/etc/hosts"
  exec 3<${FILE} 2>/dev/null || exit 1
  
  while IFS= read -ru3 TDATA ; do
      echo "${TDATA}"

      echo -n "Are you sure to loop again? (y/n) "
      read -rn1 YN
      echo
      if [[ ! ${YN} =~ ^[Yy]$ ]] ; then
          echo "No more turning around."
          exec 3<&- # close file
          exit 1
      fi
  done
  exec 3<&- # close file

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