如何使用for循环查找文件中的错误

Question

如何使用for循环从文件中查找错误（Error1、Error2、Error 3）。

一个文件包含来自4台不同机器的三种类型的错误（ strings ）。 任何机器都可能有任意数量的错误。 当发现错误时， whiptail用于创建pop-up window 。

#!/bin/sh

 
if grep -R "Error1 in Machine 1" /home/new/Report.txt
then
echo "Error1 found in Machine 1"
whiptail --title "Report Error" --msgbox "Error 1 in Machine 1" 8 78
else
echo "No Error found"
fi


if grep -R "Error2 in Machine 1" /home/new/Report.txt
then
echo "Error2 found in Machine 1"
whiptail --title "Report Error" --msgbox "Error 2 in Machine 1" 8 78
else
echo "No Error found"
fi


if grep -R "Error2 in Machine 2" /home/new/Report.txt
then
echo "Error2 found in Machine 2"
whiptail --title "Report Error" --msgbox "Error 2 in Machine 2" 8 78
else
echo "No Error found"
fi


if grep -R "Error3 in Machine 3" /home/new/Report.txt
then
echo "Error3 found in Machine 3"
whiptail --title "Report Error" --msgbox "Error 3 in Machine 3" 8 78
else
echo "No Error found"
fi

Answer 1

#!/bin/bash

grep 'Error[1-3] in Machine [1-4]' /home/new/Report.txt |
while IFS= read -r errmsg
do
        whiptail --title "Report Error" --msgbox "$errmsg" 8 78
done

该脚本没有放置“未发现错误”消息（没有消息就是好消息），但否则应该可以工作。

Answer 2

Bash 像{1..3}这样的语法通常很适合这个

for index in {1..3}; do
    [[ grep -R -q "Error${index} in Machine ${index}" /home/new/Report.txt ]] {
        echo "Error2 found in Machine ${index}"
        whiptail --title "Report Error" --msgbox "Error ${index} in Machine ${index}" 8 78
    } || {
        echo "No Error found for Machine ${index}"
    }
done

Answer 3

如果您有 3 个错误和 4 台机器，您可以使用嵌套循环来处理所有 12 种组合：

for ((e = 1; e <= 3; e++)); do
  for ((m = 1; m <= 4; m++)); do
    message="Error$e in Machine $m"
    if grep -qF "$message" /home/new/Report.txt; then
      echo "$message"
      whiptail --title "Report Error" --msgbox "$message" 8 78
    else
      echo "No Error found"
    fi
  done
done

grep选项q （安静）和F用于不打印任何内容并将模式解释为固定字符串，而不是正则表达式。

Answer 4

通过grep (1) 一次并保存 output，然后执行 rest。

#!/usr/bin/env bash

mapfile -t error_message < <(grep 'Error[[:digit:]] in Machine [[:digit:]]' /home/new/Report.txt)

((${#error_message[*]})) || { printf >&2 'No error message found\n'; exit; }

for message in "${error_message[@]}"; do
  printf '%s\n' "$message"
  whiptail --title "Report Error" --msgbox "$message" 8 78
done

Answer 5

因为你的脚本中有whiptail ，所以我猜你正在使用 Linux：

#!/bin/bash

IFS=$'\n' read -r -d '' -a errmsgs <<'EOF'
Error1 in Machine 1
Error2 in Machine 1
Error2 in Machine 2
Error3 in Machine 3
EOF

grep -o -F -f <(printf '%s\n' "${errmsgs[@]}") /home/new/Report.txt |
sort -u |
while IFS='' read -r err
do
    echo "Found $err"
    whiptail --title "Report Error" --msgbox "$err" 8 78
done

此代码将搜索errmsgs中的每个 errmsgs 字符串，删除重复项，然后一一显示错误消息。